RAYTEL MEDICAL CORP
8-K, 1997-09-02
MISC HEALTH & ALLIED SERVICES, NEC
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549



                                    FORM 8-K

                                 CURRENT REPORT

                       PURSUANT TO SECTION 13 OR 15(D) OF
                       THE SECURITIES EXCHANGE ACT OF 1934

                                 August 15, 1997
                -------------------------------------------------
                (Date of Report; Date of Earliest Event Reported)


                           Raytel Medical Corporation
             ------------------------------------------------------
             (Exact name of registrant as specified in its charter)



                                    Delaware
                 ----------------------------------------------
                 (State or other jurisdiction of incorporation)


       0-27186                                           94-2787342
- ------------------------                     ---------------------------------
(Commission File Number)                     (IRS Employer Identification No.)



2755 Campus Drive, Suite 200, San Mateo, CA                  94403
- --------------------------------------------------------------------------------
(address of principal executive offices)                   (Zip Code)


                                 (650) 349-0800
              ----------------------------------------------------
              (Registrant's telephone number, including area code)




<PAGE>   2

ITEM 2.  ACQUISITION OR DISPOSITION OF ASSETS

On August 15, 1997, and effective on that date, Raytel Medical Corporation (the
"Company") acquired all of the issued and outstanding capital stock of
Cardiovascular Ventures, Inc. ("CVI"), a Delaware corporation, pursuant to the
terms of the Stock Purchase Agreement dated August 11, 1997, by and among the
Company, CVI and the CVI stockholders. In addition, the Company entered into
cancellation agreements with those holders of options to acquire common stock
and holders of warrants who were not CVI stockholders. CVI manages, owns and
operates eight cardiovascular diagnostic facilities in those states, and owns
and manages The Heart and Family Health Institute in Port St. Lucie, Florida,
which includes cardiac facilities and a physician practice with 18 physicians,
including three cardiologists.

The aggregate purchase price was $21,600,000 consisting of cash in the amount of
$15,780,000; contingent notes in the aggregate principal amount of $820,000;
and 500,000 shares of common stock of the Company. The purchase price was 
determined after arms-length negotiations between the Company and CVI. In order
to finance the cash component of the purchase price, at the closing the Company
borrowed approximately $15,800,000 under its existing credit lines with a group
of commercial banks led by Bank of Boston Connecticut, as agent. In addition, 
the Company borrowed approximately $3,350,000 to repay a portion of the 
outstanding CVI debt. After the closing, CVI and certain of its partially owned
and consolidated ventures will have approximately $14,200,000 of other 
indebtedness primarily related to the equipment and improvements in its cardiac
laboratory ventures. The purchase price is subject to reduction, by means of 
adjustment of the amount payable under the contingent notes, based upon the 
cash flow from operations of one of the cardiovascular diagnostic facilities 
operated by CVI during the twelve months following the acquisition.

Raytel expects to record a non-recurring charge during the fourth quarter of
fiscal 1997, in an amount that is estimated will not exceed 1.5 million
dollars, principally related to the acquisition, including, but not limited to,
the costs of restructuring certain CVI indebtedness. The transaction will be 
treated as a purchase for accounting purposes.

Immediately prior to the acquisition, there was no material relationship 
between CVI and the registrant or any of its affiliates, any director or 
officer of the registrant, or any associate of any such director or officer. 
David Wertheimer, M.D., Chairman of CVI, became an officer and director of the
Company following the closing.

Immediately following the acquisition, CVI will be operated as a separate 
wholly owned subsidiary of the Company. CVI will continue to conduct its 
existing businesses following the transaction through its wholly owned 
subsidiaries, which serve as the corporate general partner in the ventures 
which own and operate the cardiovascular diagnostic facilities.




                                      -2-

<PAGE>   3


ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.

         (a)      Financial statements of business acquired:

                  It is impracticable to provide the audited financial
                  statements of CVI and its consolidated subsidiaries for the
                  periods required at the date of this report. The Company
                  intends to file such financial statements as soon as they
                  become available and in any event not later than November 1,
                  1997.

         (b)      Pro forma financial information:

                  It is impracticable to provide the pro forma financial
                  information required pursuant to Article 11 of Regulation S-X
                  at the date of this report. The Company intends to file such
                  pro forma financial information as soon as they become
                  available and in any event not later than November 1, 1997.


         (c)      The following exhibits are attached and filed herewith:

                  Exhibit No.        Description

                  2.1                Stock Purchase Agreement dated as of August
                                     11, 1997, by and among Raytel Medical
                                     Corporation, Cardiovascular Ventures, Inc.,
                                     and the stockholders of Cardiovascular
                                     Ventures, Inc., together with the form of
                                     the Escrow Agreement attached thereto as
                                     Exhibit B and the form of the Contingent
                                     Promissory Note attached thereto as Exhibit
                                     M.

                                     The above listed agreement contains a list
                                     identifying all omitted exhibits and
                                     attachments. The Company agrees to furnish
                                     supplementally a copy of any omitted
                                     exhibits or attachment to the Securities
                                     and Exchange Commission upon request.







                                      -3-

<PAGE>   4

                                   SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                       RAYTEL MEDICAL CORPORATION



Dated:  August 29, 1997                By: /s/ Richard F. Bader
                                          ------------------------------------
                                          Richard F. Bader
                                          Chairman and Chief Executive Officer



















                                      -4-

<PAGE>   5

                                  EXHIBIT INDEX



                  Exhibit No.        Description

                  2.1                Stock Purchase Agreement dated as of August
                                     11, 1997, by and among Raytel Medical
                                     Corporation, Cardiovascular Ventures, Inc.,
                                     and the stockholders of Cardiovascular
                                     Ventures, Inc., together with the form of
                                     the Escrow Agreement attached thereto as
                                     Exhibit B and the form of the Contingent
                                     Promissory Note attached thereto as Exhibit
                                     M.






<PAGE>   1


- --------------------------------------------------------------------------------
                                   EXHIBIT 2.1


                            STOCK PURCHASE AGREEMENT


                                      among


                           RAYTEL MEDICAL CORPORATION,
                             a Delaware corporation

                                   ("Raytel"),


                         CARDIOVASCULAR VENTURES, INC.,
                             a Delaware corporation

                                    ("CVI"),

                                       and

                             THE STOCKHOLDERS OF CVI
                            NAMED ON EXHIBIT A HERETO
                            (the "CVI Stockholders")



                              Dated August 11, 1997

- --------------------------------------------------------------------------------


<PAGE>   2


                                TABLE OF CONTENTS
                                -----------------


<TABLE>
<CAPTION>
                                                                                          Page

<S>                                                                                       <C>
ARTICLE I DEFINITIONS.......................................................................1

ARTICLE II PURCHASE AND SALE OF THE CVI STOCK...............................................6
        2.1  Purchase of CVI Stock from CVI Stockholders and Cancellation of CVI
                      Options and CVI Warrants..............................................6
        2.2  Further Assurances.............................................................6
        2.3  The Closing....................................................................6
        2.4  Actions at the Closing.........................................................6
        2.5   Purchase Price................................................................7
        2.6   Escrow........................................................................7
        2.7   CVI Representatives...........................................................7

ARTICLE III REPRESENTATIONS AND WARRANTIES OF CVI AND THE INDEMNIFYING CVI
                  SECURITYHOLDERS...........................................................8
        3.1   Organization and Good Standing................................................8
        3.2   CVI Capitalization............................................................9
        3.3   Subsidiaries..................................................................9
        3.4   Power, Authorization and Validity............................................10
        3.5   Absence of Violation or Conflicts............................................11
        3.6   Financial Statements.........................................................11
        3.7   Tax Matters..................................................................12
        3.8   Absence of Certain Changes or Events.........................................13
        3.9   Title and Related Matters....................................................14
        3.10  Proprietary Rights...........................................................15
        3.11  Employee Benefit Plans.......................................................16
        3.12  Bank Accounts................................................................17
        3.13  Contracts....................................................................17
        3.14  Compliance with Law..........................................................18
        3.15  Labor Difficulties...........................................................19
        3.16  Trade Regulation.............................................................19
        3.17  Certain Transactions.........................................................20
        3.18  Employees and Consultants....................................................20
        3.19  Insurance....................................................................20
        3.20  Litigation...................................................................21
        3.21  Corporate Minutes, Etc.......................................................21
        3.22  Compliance with Environmental Requirements...................................21
        3.23  Brokers .....................................................................22
        3.24  CVI Options..................................................................22
        3.25  Disclosure...................................................................22
        3.26  No Existing Discussions......................................................22

ARTICLE IV  REPRESENTATIONS AND WARRANTIES OF CVI STOCKHOLDERS.............................22
        4.1   Ownership of Stock; Authority................................................22
        4.2   Absence of Violation or Conflicts............................................23
</TABLE>


                                      -i-


<PAGE>   3


                               TABLE OF CONTENTS
                               -----------------
                                  (continued)

<TABLE>
<CAPTION>
                                                                                          Page
<S>                                                                                       <C>
        4.3  Investment Representations....................................................23
        4.4  Accredited Investor...........................................................24
        4.5  Absence of Claims Against CVI.................................................24
        4.6  Litigation....................................................................24
        4.7  No Brokers....................................................................24

ARTICLE V REPRESENTATIONS AND WARRANTIES OF RAYTEL.........................................24
        5.1  Organization and Good Standing................................................24
        5.2  Raytel Capitalization.........................................................24
        5.3  Power, Authorization and Validity.............................................25
        5.4  Absence of Violations or Conflicts............................................25
        5.5  SEC Filings; Financial Statements.............................................26
        5.6  Absence of Certain Changes or Events..........................................26
        5.7  Brokers  .....................................................................26

ARTICLE VI COVENANTS OF CVI................................................................27
        6.1  Advice of Changes.............................................................27
        6.2  Conduct of Business...........................................................27
        6.3  Risk of Loss..................................................................29
        6.4  Access to Information.........................................................29
        6.5  Regulatory Approvals..........................................................29
        6.6  Satisfaction of Conditions Precedent..........................................29
        6.7  No Solicitation...............................................................29
        6.8  CVI 1997 Audited and Unaudited Financials.....................................30

ARTICLE VII COVENANTS OF CVI STOCKHOLDERS..................................................30
        7.1  Advice of Changes.............................................................30
        7.2  Regulatory Approvals..........................................................30
        7.3  Satisfaction of Conditions Precedent..........................................30
        7.4  Disposition of Securities; Solicitation; Voting; Etc..........................30
        7.5  Other Negotiations............................................................31

ARTICLE VIII COVENANTS OF RAYTEL...........................................................31
        8.1  Advice of Changes.............................................................31
        8.2  Regulatory Approvals..........................................................31
        8.3  Satisfaction of Conditions Precedent..........................................31
        8.4  Reporting.....................................................................32

ARTICLE IX ADDITIONAL COVENANTS............................................................32
        9.1  Confidentiality...............................................................32
        9.2  Publicity.....................................................................32
        9.3  Employment Matters............................................................32
        9.4  Continuing Cooperation........................................................32
        9.5  CVI Advisory Council..........................................................32
        9.6  Disclaimer of Obligations with Respect to Operation of the Towson Center......33
</TABLE>


                                      -ii-


<PAGE>   4

                               TABLE OF CONTENTS
                               -----------------
                                  (continued)

<TABLE>
<CAPTION>
                                                                                          Page
<S>                                                                                       <C>

ARTICLE X CONDITIONS TO CLOSING............................................................33
        10.1  Conditions to Each Party's Obligations.......................................33
        10.2  Conditions to Obligations of Raytel..........................................34
        10.3  Conditions to Obligations of CVI and the CVI Stockholders....................36

ARTICLE XI  TERMINATION AND AMENDMENT; FEES AND EXPENSES...................................37
        11.1  Termination..................................................................37
        11.2  Effect of Termination by CVI.................................................37
        11.3  Fees and Expenses............................................................38

ARTICLE XII SURVIVAL OF REPRESENTATIONS AND WARRANTIES; INDEMNIFICATION....................39
        12.1  Survival of Representations and Warranties...................................39
        12.2  Indemnification by the Indemnifying CVI Securityholders......................39
        12.3  Indemnification by the CVI Stockholders......................................40
        12.4  Indemnification by Raytel....................................................41
        12.5  Procedures for Indemnification...............................................41
        12.6  Defense of Third Party Claims................................................41
        12.7  Settlement of Third Party Claims.............................................42
        12.8  Manner of Indemnification....................................................42
        12.9  CVI Representatives; Power of Attorney.......................................43

ARTICLE XIII ARBITRATION...................................................................44
        13.1  Scope   .....................................................................44
        13.2  Informal Dispute Resolution..................................................44
        13.3  Arbitration..................................................................44
        13.4  Applicable Rules and Procedure...............................................45

ARTICLE XIV MISCELLANEOUS..................................................................46
        14.1  Governing Law................................................................46
        14.2  Assignment; Binding upon Successors and Assigns..............................46
        14.3  Severability.................................................................46
        14.4  Entire Agreement.............................................................47
        14.5  Counterparts.................................................................47
        14.6  Other Remedies...............................................................47
        14.7  Waiver  .....................................................................47
        14.8  Notices .....................................................................47
        14.9  Construction and Interpretation of Agreement.................................48
        14.10  No Joint Venture............................................................49
        14.11  Specific Performance........................................................49
        14.12  Further Assurances..........................................................49
        14.13  Absence of Third Party Beneficiary Rights...................................49
</TABLE>


                                     -iii-


<PAGE>   5


                                TABLE OF CONTENTS
                                   (continued)


                                    EXHIBITS
                                    --------


<TABLE>
<CAPTION>
Exhibit             Description
- -------             -----------
<S>                <C>
   A                CVI Stockholders and Consideration Schedule
   B                Form of Escrow Agreement
   C                CVI Disclosure Schedule
   D                CVI Stockholder Disclosure Schedule
   E                Form of Non-Competition Agreement
   F                Form of Opinion of McGlinchey Stafford
   G                Form of Opinion of Gray Cary Ware & Freidenrich
   H                Schedule of Prospects
   I                Forms of Waivers
   J                Form of CVI Stockholder Option Cancellation Agreement
   K                Form of Non-Stockholder Option Cancellation Agreement
   L                Form of Warrant Cancellation Agreement
   M                Form of Raytel Note
</TABLE>


                                      -iv-


<PAGE>   6
                            STOCK PURCHASE AGREEMENT


        THIS STOCK PURCHASE AGREEMENT is entered into as of August 11, 1997, by
and among RAYTEL MEDICAL CORPORATION, a Delaware corporation ("Raytel"),
CARDIOVASCULAR VENTURES, INC., a Delaware corporation ("CVI"), and each of the
stockholders of CVI identified as holders of CVI Common Stock or CVI Preferred
Stock on Exhibit A to this Agreement (collectively, the "CVI Stockholders").


                                    RECITALS


        A. The CVI Stockholders collectively own all of the outstanding shares
of the capital stock of CVI and certain options and warrants to purchase such
capital stock, as set forth opposite their respective names on Exhibit A hereto;
and

        B. Raytel desires to purchase, and the CVI Stockholders desire to sell,
such shares of CVI capital stock, and the parties desire to cancel such options
and warrants for the consideration set forth on Exhibit A, subject to the terms
and conditions of this Agreement.

        NOW, THEREFORE, in consideration of the foregoing and the respective
representations, warranties, covenants and agreements set forth below, the
Parties hereby agree as follows:

                                    ARTICLE I
                                   DEFINITIONS

        The following terms when used herein have the meanings set forth below:

        1.1 "Acquisition" has the meaning set forth in Section 2.3.

        1.2 "Acquisition Proposal" has the meaning set forth in Section 6.7.

        1.3 "Affiliate" has the meaning set forth in the rules and regulations
promulgated by the SEC under the Securities Act.

        1.4 "Alternative Transaction" has the meaning set forth in Section
11.3(c).

        1.5 "Cap" has the meaning set forth in Section 12.2(c).

        1.6 "Cash Payment" means the cash payable to the CVI Stockholders in the
Acquisition pursuant to Section 2.4(d).

        1.7 "Closing" has the meaning set forth in Section 2.1.

        1.8 "Closing Date" has the meaning set forth in Section 2.3.


                                      -1-


<PAGE>   7


        1.9 "Code" means the Internal Revenue Code of 1986, as amended.

        1.10 "Confidentiality Agreement" means the Confidentiality and Non-Use
Agreement dated as of June 13, 1997, by and between Raytel and CVI.

        1.11 "CVI 401(k) Expenses" has the meaning set forth in Section 12.2(b).

        1.12 "CVI 401(k) Plan" has the meaning set forth in Section 3.11(a).

        1.13 "CVI Advisory Council" has the meaning set forth in Section 9.5(a).

        1.14 "CVI Audited Financials" means (i) CVI's consolidated balance
sheets as of June 30, 1994, June 30, 1995 and June 30, 1996 and its consolidated
statements of revenues and expenses, stockholders' equity and cash flows for the
fiscal years then ended, and (ii) the balance sheets of each CVI Venture as of
June 30, 1994, June 30, 1995 and June 30, 1996 and their respective statements
of revenues and expenses, partners' capital and cash flows for the fiscal years
then ended, in each case audited and reported upon by Deloitte & Touche LLP,
independent certified public accountants.

        1.15 "CVI Common Stock" means the Common Stock, $0.0001 par value, of
CVI.

        1.16 "CVI Disclosure Schedule" means Exhibit C hereto.

        1.17 "CVI Equipment Leases" has the meaning set forth in Section 3.9(c).

        1.18 "CVI Financial Statements" means the CVI Audited Financials, the
CVI Unaudited Financials and, when prepared and delivered hereunder, the CVI
1997 Audited Financials.

        1.19 "CVI Group" and "CVI Losses" have the respective meanings set forth
in Section 12.4(a).

        1.20 "CVI May Balance Sheet" means CVI's unaudited consolidated balance
sheet as of May 31, 1997 contained in the CVI Unaudited Financials.

        1.21 "CVI 1997 Audited Financials" has the meaning set forth in Section
6.8.

        1.22 "CVI Options" means options to acquire CVI Common Stock.

        1.23 "CVI Preferred Stock" means CVI Series A Preferred Stock, CVI
Series B Preferred Stock and CVI Series C Preferred Stock.

        1.24 "CVI Real Property Leases" has the meaning set forth in Section
3.9(d).

        1.25 "CVI Representatives" means David Wertheimer, M.D. and Robert Finzi
or their respective successors appointed in accordance with Sections 2.7 and
12.9.

        1.26 "CVI Securityholders" means the holders of CVI Stock, CVI Options
and CVI Warrants.


                                        2


<PAGE>   8


        1.27 "CVI Series A Preferred Stock" means the Series A Preferred Stock,
$0.0001 par value, of CVI.

        1.28 "CVI Series B Preferred Stock" means the Series B Preferred Stock,
$0.0001 par value, of CVI.

        1.29 "CVI Series C Preferred Stock" means the Series C Preferred Stock,
$0.0001 par value, of CVI.

        1.30 "CVI Stock" means CVI Common Stock and CVI Preferred Stock.

        1.31 "CVI Stockholder Disclosure Schedule" means Exhibit D hereto.

        1.32 "CVI Stockholders" has the meaning set forth in the preamble of
this Agreement.

        1.33 "CVI Stockholder Option Cancellation Agreement" means the Option
Cancellation Agreement in the form of Exhibit J hereto.

        1.34 "CVI Subsidiaries" has the meaning set forth in Section 3.3(a).

        1.35 "CVI Unaudited Financials" means (i) CVI's unaudited consolidated
balance sheet as of May 31, 1997 and its unaudited consolidated statements of
revenues and expenses and cash flows for the eleven-month period then ended and
(ii) the unaudited balance sheets of each CVI Venture as of May 31, 1997 and
their respective unaudited statements of revenues and expenses and cash flows
for the eleven-month period then ended.

        1.36 "CVI Ventures" means the CVI Subsidiaries that are limited
partnerships.

        1.37 "CVI Vested Options" means CVI options that are vested on the
Closing Date and have an exercise price that is less than the Calculated Per
Share Amount set forth on Exhibit A hereto.

        1.38 "CVI Warrants" means warrants to acquire CVI Common Stock.

        1.39 "Delaware Law" means the Delaware General Corporation Law.

        1.40 "Dispute" has the meaning set forth in Section 13.1.

        1.41 "Encumbrances" means, with respect to an item, claims, liabilities,
liens, pledges, mortgages, restrictions, options, charges and encumbrances of
any kind, whether accrued, absolute, contingent or otherwise, affecting that
item.

        1.42 "ERISA" means the Employee Retirement Income Security Act of 1974,
as amended.

        1.43 "Escrow Agent" means First Trust of California, N.A.


                                        3


<PAGE>   9


        1.44 "Escrow Agreement" means the Escrow Agreement substantially in the
form of Exhibit B hereto by and among Raytel, the CVI Representatives, for and
on behalf of the Indemnifying CVI Securityholders, and the Escrow Agent.

        1.45 "Escrow Amount" has the meaning set forth in Section 2.6.

        1.46 "Exchange Act" means the Securities and Exchange Act of 1934, as
amended.

        1.47 "GAAP" means generally accepted accounting principles, consistently
applied.

        1.48 "Governmental Entity" means any court, administrative agency or
commission or other governmental authority or agency, domestic or foreign.

        1.49 "Indemnitee" and "Indemnitor" have the respective meanings set
forth in Section 12.5(a).

        1.50 "Indemnification Claim" has the meaning set forth in Section
12.5(b).

        1.51 "Indemnifying CVI Securityholder" has the meaning set forth in
Section 12.2(a).

        1.52 "Initial Cash Consideration" has the meaning set forth in Section
2.5.

        1.53 "Knowledge of CVI and the Indemnifying CVI Securityholders" has the
meaning set forth in Section 14.9(d).

        1.54 "Material Adverse Effect" with respect to any entity means a
material adverse effect on the business, assets (including intangible assets),
financial condition or results of operations of such entity and its
Subsidiaries, taken as a whole.

        1.55 "Non-Competition Agreement" means the Non-Competition Agreement in
the form of Exhibit E hereto.

        1.56 "Non-Stockholder Option Cancellation Agreement" means the Option
Cancellation Agreement in the form of Exhibit K hereto.

        1.57 "Partnership" has the meaning set forth in Section 9.6.

        1.58 "Presiding Arbitrator" has the meaning set forth in Section 13.3.

        1.59 "Proprietary Rights" has the meaning set forth in Section 3.10(a).

        1.60 "Raytel Balance Sheet" means Raytel's unaudited consolidated
balance sheets as of March 31, 1997 contained in Raytel SEC Reports.

        1.61 "Raytel Closing Price" means the average closing price per share of
Raytel Common Stock (as quoted on The Nasdaq National Market and reported in The
Wall Street Journal) during the 20 trading days prior to and including the last
trading day before the Closing Date.


                                       4


<PAGE>   10


        1.62 "Raytel Common Stock" means the Common Stock, $0.001 par value, of
Raytel.

        1.63 "Raytel CVI-Related Losses" has the meaning set forth in Section
12.2(a).

        1.64 "Raytel CVI Stockholder-Related Losses" has the meaning set forth
in Section 12.3(a).

        1.65 "Raytel Group" has the meaning set forth in Section 12.2(a).

        1.66 "Raytel Losses" has the meaning set forth in Section 12.3(a).

        1.67 "Raytel Notes" means contingent promissory notes, in the form of
Exhibit M hereto, in the aggregate principal amount of $820,000 to be issued by
Raytel in the Acquisition to certain CVI Stockholders, as set forth on Exhibit A
hereto.

        1.68 "Raytel SEC Reports" has the meaning set forth in Section 5.5(a).

        1.69 "Raytel Shares" means the shares of Raytel Common Stock issuable to
the CVI Stockholders in the Acquisition pursuant to Sections 2.4 and 2.5.

        1.70 "SEC" means the Securities and Exchange Commission.

        1.71 "Subsidiary" means, with respect to any parent corporation or other
entity, a corporation or other entity in which a percentage of its voting
securities sufficient to elect at least a majority of the Board of Directors or
other managers is owned or otherwise controlled, directly or indirectly, by such
parent corporation or other entity.

        1.72 The term "tax" includes all federal, state, local and foreign
income, property, employment, sales, use, license, payroll, occupation,
franchise, occupation, recording, value added, transfer, excise and other taxes,
fees, levies or assessments of any nature whatsoever (whether payable directly
or by withholding) and, with respect to such tax, any estimated tax, interest,
penalties and additions and related charges of Governmental Entities.

        1.73 "Termination Fee" has the meaning set forth in Section 11.3(b).

        1.74 "Third Party Claim" has the meaning set forth in Section 12.6.

        1.75 "Third Party Licenses" and "Third Party Technology" have the
respective meanings set forth in Section 3.10(b).

        1.76 "Total Acquisition Consideration" has the meaning set forth in
Section 2.5.

        1.77 "Towson Center" has the meaning set forth in Section 9.6.

        1.78 "Transaction Documents" means this Agreement and all other
agreements and documents to be executed and delivered pursuant hereto.

        1.79 "Waiver" means the Waiver in the form of Exhibit K hereto.


                                       5


<PAGE>   11


        1.80 "Warrant Cancellation Agreement" means the Warrant Cancellation
Agreement in the form of Exhibit L hereto.

                                   ARTICLE II
                       PURCHASE AND SALE OF THE CVI STOCK

        2.1 Purchase of CVI Stock from CVI Stockholders and Cancellation of CVI
Options and CVI Warrants. Upon and subject to the terms and conditions of this
Agreement, at the closing of the transactions contemplated by this Agreement
(the "Closing"), each CVI Stockholder shall sell, transfer, convey, assign and
deliver to Raytel, and Raytel shall purchase, acquire and accept from each CVI
Stockholder, all of the CVI Stock owned by such CVI Stockholder, and each CVI
Stockholder who holds CVI Options or CVI Warrants will agree to the cancellation
and termination thereof.

        2.2 Further Assurances. At any time and from time to time after the
Closing, at Raytel's request and without further consideration to any of the CVI
Stockholders, each CVI Stockholder shall promptly execute and deliver such
instruments of sale, transfer, conveyance, assignment, cancellation and
confirmation, and take all such other action as Raytel may reasonably request,
more effectively to transfer, convey and assign to Raytel, and to confirm
Raytel's title to, all of such CVI Stockholder's CVI Stock, to confirm the
cancellation of such CVI Stockholder's CVI Options or CVI Warrants, to put
Raytel (through its ownership of CVI) in actual possession and operating control
of the assets (including without limitation the original corporate minute books
of CVI and all corporate seals), properties and businesses of CVI, to assist
Raytel in exercising all rights with respect thereto and to carry out the
purposes and intents of this Agreement.

        2.3 The Closing. The Closing of the acquisition of the outstanding CVI
Stock and the cancellation of the CVI Options and CVI Warrants pursuant to this
Agreement (the "Acquisition") shall take place at the offices of Gray Cary Ware
& Freidenrich, A Professional Corporation, 400 Hamilton Avenue, Palo Alto,
California 94301-1825, at 10:00 a.m. Pacific Time, on a date to be specified by
Raytel and CVI (the "Closing Date"), which shall be no later than the second
business day after satisfaction or waiver of the conditions to the obligations
of the parties set forth in Article X, unless another date or place is agreed to
in writing by Raytel and CVI.

        2.4 Actions at the Closing. At the Closing:

            (a) CVI shall deliver to Raytel the various certificates,
instruments and documents referred to in paragraphs (a) and (b) of Section 10.2;

            (b) Each CVI Stockholder shall deliver to Raytel (i) certificates
representing all of the CVI Stock owned by such CVI Stockholder, (ii) a stock
power, or other appropriate instrument of transfer duly executed by such CVI
Stockholder and reasonably acceptable to Raytel, with the CVI Stockholder's
signature guaranteed by an eligible institution with membership in a "medallion"
signature guarantee program, and (iii) if such CVI Stockholder is the holder of
any CVI Options or CVI Warrants, a duly executed CVI Stockholder Option


                                       6


<PAGE>   12


Cancellation Agreement or Warrant Cancellation Agreement effecting the
cancellation and termination thereof;

            (c) Raytel shall deliver to CVI the various certificates,
instruments and documents referred to in paragraphs (a) and (b) of Section 10.3;

            (d) Raytel shall deliver to the CVI Representatives, for
distribution to the CVI Stockholders, (i) stock certificates representing the
Raytel Shares, (ii) checks or wire transfers representing cash in the amount of
the Initial Cash Consideration and (iii) the Raytel Notes in accordance with
Section 2.5; and

            (e) Raytel, each of the Indemnifying CVI Securityholders and the
Escrow Agent shall execute and deliver the Escrow Agreement, and Raytel shall
deliver to the Escrow Agent a check or wire transfer for the Escrow Amount being
placed into escrow on the Closing Date pursuant to Section 2.6.

        2.5 Purchase Price. The purchase price to be paid by Raytel to each CVI
Stockholder for such CVI Stockholder's CVI Stock and the cancellation of such
CVI Stockholder's CVI Options or CVI Warrants shall be the amount set forth
opposite such CVI Stockholder's name on Exhibit A under the caption "Total
Acquisition Consideration," which is the aggregate sum of the amounts, if any,
set forth opposite such CVI Stockholder's name under the captions "Initial Cash
Consideration," "Escrow Amount," "Raytel Notes," and "Raytel Stock at $10.00"
(which is the number of Raytel Shares to be received by such CVI Stockholder,
valued for the purpose of Exhibit A at $10.00 per share). The amount of the
Initial Cash Consideration is subject to pro rata reduction pursuant to Section
11.3(a). Each CVI Stockholder will be entitled to receive at the Closing the
Initial Cash Consideration, the Raytel Notes, and a certificate representing the
number of Raytel Shares set forth opposite such CVI Stockholder's name on
Exhibit A.

        2.6 Escrow. At the Closing, Raytel will deposit the total amount set
forth as the Escrow Amount on Exhibit A (an aggregate of $500,000, which is the
"Escrow Amount") into an interest bearing escrow account with the Escrow Agent
to be held pursuant to the terms of the Escrow Agreement.

        2.7 CVI Representatives.

            (a) In order to efficiently administer the Acquisition and the
transactions contemplated hereby, including (i) the waiver of any condition to
the obligations of the CVI Stockholders to consummate the Acquisition and the
transactions contemplated hereby and (ii) the defense and/or settlement of any
claims for which the Indemnifying CVI Securityholders may be required to
indemnify Raytel and/or CVI pursuant to the Escrow Agreement, the CVI
Stockholders, including the Indemnifying CVI Securityholders, hereby designate
David Wertheimer, M.D. and Robert Finzi or their respective successors appointed
in accordance with Section 12.8, as their representatives (the "CVI
Representatives").

            (b) The CVI Stockholders hereby authorize the CVI Representatives
(i) to take all action necessary in connection with the waiver of any condition
to the obligations of the 


                                       7


<PAGE>   13


CVI Stockholders to consummate the Acquisition and the transactions contemplated
hereby, or the defense and/or settlement of any claims for which the
Indemnifying CVI Securityholders may be required to indemnify Raytel and/or CVI
pursuant to the Escrow Agreement, (ii) to give and receive all notices required
to be given under this Agreement and the Escrow Agreement (with the exception of
Indemnification Claims delivered after the termination of the Escrow Agreement),
and (iii) to take any and all additional action as is contemplated to be taken
by or on behalf of the CVI Stockholders by the terms of this Agreement or the
Escrow Agreement.

            (c) By his execution of this Agreement, each CVI Stockholder
(including each Indemnifying CVI Securityholder) agrees that:

                       (i) the provisions of this Section 2.7 are independent
and severable, are irrevocable and coupled with an interest and shall be
enforceable notwithstanding any rights or remedies that any CVI Stockholder may
have in connection with the Acquisition and the transactions contemplated by
this Agreement;

                       (ii) remedies available at law for any breach of the
provisions of this Section 2.7 are inadequate; therefore, Raytel and CVI shall
be entitled to temporary and permanent injunctive relief without the necessity
of proving damages if either Raytel and/or CVI brings an action to enforce the
provisions of this Section 2.7; and

                       (iii) the provisions of this Section 2.7 shall be binding
upon the executors, heirs, legal representatives, personal representatives,
successor trustees, and successors of each CVI Stockholder, and any references
in this Agreement to a CVI Stockholder or the CVI Stockholders shall mean and
include the successors to the CVI Stockholders' rights hereunder, whether
pursuant to testamentary disposition, the laws of descent and distribution or
otherwise.

                                   ARTICLE III
           REPRESENTATIONS AND WARRANTIES OF CVI AND THE INDEMNIFYING
                               CVI SECURITYHOLDERS

        Except as set forth in the CVI Disclosure Schedule, each of CVI and each
Indemnifying CVI Securityholder, jointly and severally, represents and warrants
to Raytel that:

        3.1 Organization and Good Standing. CVI is a corporation duly organized,
validly existing and in good standing under the laws of the State of Delaware
and has all requisite corporate power and authority to own, operate and lease
its properties and to carry on its business as now conducted and as proposed to
be conducted. CVI is duly qualified or licensed to do business and in good
standing in each jurisdiction in which the nature of its business or properties
makes such qualification or licensing necessary, except where the lack of such
qualification or licensing would not have a Material Adverse Effect on CVI.
True, correct and complete copies of CVI's Certificate of Incorporation and
By-Laws, as in effect on the date hereof and as will be in effect immediately
prior to the Closing, have been delivered to counsel for Raytel and are attached
to the CVI Disclosure Schedule. The CVI Disclosure Schedule lists the locations
of all offices and facilities of CVI and all states in which CVI maintains any
employees.


                                       8


<PAGE>   14


The CVI Disclosure Schedule lists all states in which CVI is qualified or
licensed to transact business as a foreign corporation.

        3.2 CVI Capitalization.

            (a) The authorized capital stock of CVI consists of, and immediately
prior to the Closing will consist of, (i) 6,000,000 shares of CVI Preferred
Stock, of which 2,000,000 shares have been designated as CVI Series A Preferred
Stock, 2,000,000 shares have been designated as CVI Series B Preferred Stock,
and 2,000,000 shares have been designated as CVI Series C Preferred Stock and
(ii) 10,000,000 shares of CVI Common Stock. As of the date hereof, 800,000
shares of CVI Series A Preferred Stock, 910,373 shares of CVI Series B Preferred
Stock, 571,429 shares of CVI Series C Preferred Stock and 1,507,000 shares of
CVI Common Stock are issued and outstanding. All such issued and outstanding
shares have been duly authorized, validly issued, fully paid and are
nonassessable and were issued and sold in compliance with all applicable state
and federal securities laws. As of the date hereof, CVI has reserved for
issuance (i) 1,359,000 shares of CVI Common Stock issuable upon the exercise of
outstanding CVI Options; (ii) 225,000 shares of CVI Common Stock issuable upon
the exercise of outstanding CVI Warrants; and (iii) the shares of CVI Common
Stock issuable upon conversion of the CVI Preferred Stock in accordance with
CVI's Certificate of Incorporation.

            (b) Except for the foregoing, there are no outstanding rights,
options, warrants, conversion rights or other agreements for the purchase or
acquisition from CVI of any shares of its capital stock or securities
convertible into or exchangeable for any shares of such capital stock. All CVI
Options and CVI Warrants will terminate or be cancelled upon or prior to the
Closing. There are no preemptive rights to purchase or otherwise acquire any
securities of CVI pursuant to any provision of law or the Certificate of
Incorporation or By-Laws of CVI, any agreement to which CVI is a party or, to
the Knowledge of CVI and the Indemnifying CVI Securityholders, otherwise. There
is no voting or stock restriction agreement, proxy or similar agreement
applicable to any securities of CVI to which CVI is a party or, to the Knowledge
of CVI and the Indemnifying CVI Securityholders, otherwise.

        3.3 Subsidiaries.

            (a) CVI does not own any equity interest, directly or indirectly, in
any corporation, partnership, joint venture or other entity except the
corporations, joint ventures and limited partnerships identified in the CVI
Disclosure Schedule (collectively, the "CVI Subsidiaries"). Each CVI Subsidiary
is duly organized, validly existing and in good standing under the laws of the
jurisdiction of its organization and has all requisite corporate power and
authority to own, operate and lease its properties and to carry on its business
as now conducted and as proposed to be conducted. Each CVI Subsidiary is duly
qualified or licensed to do business and in good standing in each jurisdiction
in which the nature of its business or properties makes such qualification or
licensing necessary, except where the lack of such qualification would not have
a Material Adverse Effect on CVI. The CVI Schedule sets forth a listing, as to
each CVI Subsidiary, of the nature and amount of the interest held by CVI, the
identity of each other shareholder, co-venturor, partner and/or manager of such
CVI Subsidiary, the date and 


                                       9


<PAGE>   15


jurisdiction of its organization, the locations of all of its offices and
facilities, the states in which it maintains any employees and the states in
which it is qualified or licensed to transact business.

            (b) All of the capital stock, partnership interests or joint venture
interests of each CVI Subsidiary owned by CVI or another CVI Subsidiary are duly
authorized, validly issued and outstanding and owned, of record and
beneficially, by CVI or such CVI Subsidiary, free and clear of any Encumbrances
or restrictions (other than restrictions on transfer under applicable federal
and state securities laws) and not subject to requirements to make any further
capital contributions.

            (c) All of the partnership interests or joint venture interests of
each CVI Subsidiary that are not owned, directly or indirectly, by CVI are duly
authorized, validly issued and outstanding and were issued and sold in
compliance with all applicable state and federal securities laws, including,
without limitation, all laws and regulations governing the conduct of brokers
and dealers.

            (d) Except as set forth in the CVI Disclosure Schedule, there are no
outstanding rights, options, warrants, conversion rights or other agreements for
the purchase or acquisition from CVI or any CVI Subsidiary of equity securities
of any CVI Subsidiary or securities convertible into or exchangeable for any
such equity securities. There are no preemptive rights to purchase or otherwise
acquire any securities of any CVI Subsidiary pursuant to any provision of law or
the Certificate of Incorporation, Bylaws, partnership agreements or other
charter documents of such CVI Subsidiary, any agreement to which CVI or any CVI
Subsidiary is a party or, to the Knowledge of CVI and the Indemnifying CVI
Securityholders, otherwise. There is no voting or stock restriction agreement,
proxy or similar agreement applicable to any securities of any CVI Subsidiary to
which CVI or any CVI Subsidiary is a party or, to the Knowledge of CVI and the
Indemnifying CVI Securityholders, otherwise.

        3.4 Power, Authorization and Validity.

            (a) CVI has all requisite corporate right, power, legal capacity and
authority to execute and deliver, and to consummate the transactions
contemplated by, this Agreement and each of the other Transaction Documents to
which CVI is or will be a party and to perform its obligations under each of
them. The execution and delivery of, and the consummation of the transactions
contemplated by, this Agreement and each of the other Transaction Documents to
which CVI is or will be a party has been duly and validly approved and
authorized by the Board of Directors of CVI and all other necessary corporate
action on the part of CVI, except for approval by the CVI Stockholders.

            (b) No consent, approval, order or authorization of, or
registration, declaration or filing with, any Governmental Entity, is required
by or with respect to CVI in connection with the execution and delivery of, and
the consummation by CVI of the transactions contemplated by, this Agreement or
any of the other Transaction Documents to which CVI is or will be a party, or to
permit CVI to continue after the Acquisition, without material change, the
business activities of CVI as currently conducted and as proposed to be
conducted.


                                       10


<PAGE>   16


            (c) This Agreement and each of the other Transaction Documents to
which CVI is or will be a party has been, or upon its execution and delivery by
CVI will have been, duly executed and delivered by CVI and, subject to any
required CVI Stockholder approval of that Transaction Document, constitutes or
will constitute upon its execution and delivery, a valid and binding obligation
of CVI, enforceable against CVI in accordance with its terms.

        3.5 Absence of Violation or Conflicts. The execution and delivery by CVI
of this Agreement and each of the other Transaction Documents do not, and the
consummation of the transactions contemplated hereby and thereby and compliance
with the provisions hereof and thereof will not, conflict with, or result in any
violation of or default under, or give rise to a right of termination,
cancellation or acceleration of any obligation, or any right of first refusal or
first option or to the loss of a benefit under, (i) any provision of the
Certificate of Incorporation or By-Laws or other charter documents of CVI or any
CVI Subsidiary, (ii) any loan or credit agreement, note, bond, mortgage,
indenture, lease, partnership agreement or other agreement, instrument, permit,
concession, franchise or license to which CVI or any CVI Subsidiary is a party
or by which any of them or any of their respective properties or assets is bound
or affected, or (iii) any judgment, order, decree, statute, law, ordinance, rule
or regulation applicable to CVI or any CVI Subsidiary or any of their respective
properties or assets. The consummation of the Acquisition will not require the
consent of any third party or have a material adverse effect upon any right,
license, franchise, lease or agreement of CVI.

        3.6 Financial Statements.

            (a) CVI has delivered to Raytel true and correct copies of all of
the CVI Financial Statements with the exception of the CVI 1997 Audited
Financials to be delivered pursuant to Section 6.8. The CVI Financial Statements
have been, and will be, prepared in accordance with GAAP and present, and will
present, fairly the consolidated financial position of CVI and the financial
position of each of the CVI Ventures as of their respective dates and the
results of operations, equity transactions and cash flows of CVI and each of the
CVI Ventures for the periods indicated, except that the CVI Unaudited Financials
(i) are subject to normal year-end adjustments, which adjustments will not
individually or in the aggregate be material, and (ii) do not contain all
footnotes required under GAAP.

            (b) Neither CVI nor any CVI Subsidiary has any liabilities, either
accrued or contingent, and whether due or to become due, other than (i)
liabilities reflected or provided for on the CVI May Balance Sheet, (ii)
liabilities specifically described in this Agreement, (iii) normal or recurring
liabilities incurred since May 31, 1997 in the ordinary course of business
consistent with past practices, and (iv) liabilities not required by GAAP to be
reflected on a balance sheet.

            (c) The CVI Disclosure Schedule contains a complete and correct list
of all accounts receivable of CVI and each CVI Subsidiary as of the date set
forth thereon. All such accounts receivable, and such additional accounts
receivable accrued between the date of such list and the Closing Date arose, or
will arise, in the ordinary and usual course of CVI's business, and have been,
or will be, appropriately recorded in a manner consistent with CVI's past
practice. None of such accounts receivable is subject to any material claim of
offset or recoupment and, to the Knowledge of CVI and the Indemnifying CVI
Securityholders, there are no facts that would 


                                       11


<PAGE>   17


be likely to give rise to any such claim. No material amount of such accounts
receivable is contingent upon the performance by CVI or any CVI Subsidiary of
any obligation, and no agreement for deduction or discount has been made with
respect to any such accounts receivable. Notwithstanding the foregoing, neither
CVI nor the Indemnifying CVI Securityholders warrant that the amount reflected
on the CVI Disclosure Schedule is the precise amount which Raytel will realize
through Raytel's collection efforts.

        3.7 Tax Matters.

            (a) CVI and each of the CVI Subsidiaries has duly filed all tax
returns, reports and estimates required to be filed by it, for all years and
periods (and portions thereof) for which any such returns, reports or estimates
were due on or prior to the Closing Date. All such returns, reports and
estimates, as filed, were complete, correct and accurate in all material
respects. All taxes due from CVI and each of the CVI Subsidiaries, and not
subject to a bona fide dispute, have been paid with respect to years and periods
ending on or prior to the Closing Date. Neither CVI nor any CVI Subsidiary has
received notice of any pending assessments, asserted deficiencies or claims for
additional taxes that are payable and have not been paid, except to the extent
that they are subject to a bona fide dispute with the relevant taxing authority.
The reserves for taxes, if any, reflected on the CVI May Balance Sheet are
adequate and there are no tax liens on any property or asset of CVI. There have
been no examinations of any of tax returns or reports of CVI or any of the CVI
Subsidiaries by any Governmental Entity. There are no outstanding agreements or
waivers extending the statutory period of limitation applicable to any tax
return or report of CVI or any of the CVI Subsidiaries for any period and no
request for such an agreement or waiver is pending.

            (b) All taxes that CVI or any CVI Subsidiary has been required to
collect or withhold have been duly collected or withheld and, to the extent
required, have been paid to the proper taxing authority.

            (c) Neither CVI nor any CVI Subsidiary is a party to any tax-sharing
agreement or similar arrangement with any other party.

            (d) Neither CVI nor any CVI Subsidiary is obligated to make any
"parachute payment," as defined in Section 280G of the Code.

            (e) Neither CVI nor any CVI Subsidiary will be required to include
any material adjustment in taxable income for any tax period (or portion
thereof) ending after the Closing Date pursuant to Section 481(c) of the Code or
any provision of the tax laws of any jurisdiction requiring tax adjustments as a
result of a change in method of accounting implemented prior to the Closing Date
for any tax period (or portion thereof) ending on or before the Closing Date or
pursuant to the provisions of any agreement entered into by CVI or such CVI
Subsidiary prior to the Closing Date with any taxing authority with regard to
the tax liability of CVI of such CVI Subsidiary for any tax period (or portion
thereof) ending on or before the Closing Date.


                                       12


<PAGE>   18


            (f) Neither CVI nor any CVI Subsidiary is under any contractual
obligation to pay any tax obligations of any other person, or any tax obligation
with respect to any transaction of any other person or to indemnify any other
person with respect to any tax.

            (g) Neither CVI nor any CVI Subsidiary has at any time filed a
consent to the application of Section 341(f)(2) of the Code to any property or
assets held, acquired or to be acquired by it.

        3.8 Absence of Certain Changes or Events. Since May 31, 1997, CVI and
each of the CVI Subsidiaries have conducted their respective businesses in the
ordinary course and in a manner consistent with past practices and, since such
date, have not:

            (a) suffered any event or occurrence which has had a Material
Adverse Effect on CVI or such CVI Subsidiary;

            (b) suffered any damage, destruction or loss, whether or not covered
by insurance, that had a material adverse effect on its properties or business;

            (c) granted any increase in the compensation payable or to become
payable by CVI to its officers or employees, except increases to non-officer
employees occurring in the ordinary course of business and consistent with past
practices;

            (d) declared, set aside or paid any dividend or made any other
distribution on or in respect of the shares of its capital stock or declared any
direct or indirect redemption, retirement, purchase or other acquisition of such
shares;

            (e) issued any shares of its capital stock or partnership interests
or any warrants, rights or options for, or entered into any other commitment
relating to, its capital stock or partnership interests;

            (f) made any change in the accounting methods or practices it has
followed in the preparation of the CVI Financial Statements, or made any
adjustment to any of the CVI Unaudited Financials, whether for general financial
or tax purposes, or any change in depreciation or amortization policies or
rates;

            (g) sold, leased, abandoned or otherwise disposed of any real
property or any equipment or other operating property, other than in the
ordinary course of its business;

            (h) sold, assigned, transferred, or otherwise disposed of any
patent, trademark, service mark, tradename, brand name, copyright (or pending
application therefor), invention, process, know-how, formula or trade secret or
interest therein or other intangible asset or licensed any of the foregoing,
except under licenses referenced in the CVI Disclosure Schedule;

            (i) entered into any material commitment or obligation, except in
the ordinary course of business and under agreements referenced in the CVI
Disclosure Schedule;


                                       13


<PAGE>   19


            (j) incurred any liability (including, without limitation, any
contingent liability with respect to the obligation of others), except in the
ordinary course of business or in connection with the transactions contemplated
by this Agreement, that would be required to be disclosed in financial
statements prepared in accordance with GAAP;

            (k) permitted or allowed any of its property or assets to be
subjected to any Encumbrance, except for purchase money security interests and
liens of current taxes not yet due and payable;

            (l) made any capital expenditure or commitment for additions to
property, plant or equipment in excess of $100,000, or $250,000 in the
aggregate;

            (m) paid, loaned or advanced any amount to, or sold, transferred or
leased any properties or assets to, or entered into any agreement or arrangement
with, any of its Affiliates, officers, directors or stockholders or any
Affiliate of any of the foregoing;

            (n) agreed to take any action described in this Section 3.8 or
outside of the ordinary course of its business or that would constitute a breach
of any of the representations or warranties of CVI contained this Agreement.

        3.9 Title and Related Matters.

            (a) CVI and each of the CVI Subsidiaries have good and marketable
title to all their respective properties, interests in properties and assets,
real and personal, reflected on the CVI May Balance Sheet or acquired after the
date of such balance sheet (except properties, interests in properties and
assets sold or otherwise disposed of since the date of such balance sheet in the
ordinary course of business), free and clear of all Encumbrances, except for
purchase money security interests and the lien of current taxes not yet due and
payable.

            (b) CVI and the CVI Subsidiaries own or lease all equipment and all
other tangible assets and properties which are material to the conduct of their
respective businesses as currently conducted. The CVI Disclosure Schedule
includes a complete and accurate list describing and specifying the location of
all of the equipment and other tangible assets and properties owned by CVI and
the CVI Subsidiaries or used in their businesses and having an original cost in
excess of $2,000. To the knowledge of CVI and the Indemnifying CVI
Securityholders, all of such equipment and tangible assets and properties is in
good operating condition and repair, subject to reasonable wear and tear.

            (c) The CVI Disclosure Schedule includes a complete and accurate
list of each lease under which CVI or any CVI Subsidiary is the lessor,
sublessor, lessee or sublessee of any equipment or other tangible assets or
properties (including any related master leases) (the "CVI Equipment Leases"),
describing each such lease and the type and location of the property which is
the subject thereof. True and correct copies of all CVI Equipment Leases have
been provided to counsel for Raytel. All CVI Equipment Leases are in full force
and effect and valid, binding and enforceable in accordance with their terms.


                                       14


<PAGE>   20


            (d) Neither CVI nor any CVI Subsidiary owns any real property in fee
simple. The CVI Disclosure Schedule includes a complete and accurate list of
each real property lease under which CVI or any CVI Subsidiary is the lessee,
sublessee or sublessor of any real property (including any related master
leases) (the "CVI Real Property Leases"), describing each such lease and the
location of the property which is the subject thereof. True and correct copies
of all CVI Real Property Leases have been provided to counsel for Raytel. All
CVI Real Property Leases are in full force and effect and valid, binding and
enforceable in accordance with their terms.

        3.10 Proprietary Rights.

            (a) CVI and each of the CVI Subsidiaries own all right, title and
interest in, to, under and with respect to, all intellectual property rights
material to the conduct of their respective businesses, including without
limitation, (i) patents, trademarks, service marks, copyrights and applications
therefor and registrations thereof, and tradenames and trade styles, (ii) trade
secrets (including without limitation know-how, facility layouts and designs,
patient flow procedures, medical protocols, patient and customer lists,
referring physician information, prospect lists, and business and marketing
plans), and confidential and other proprietary information, and (iii) computer
software and data material to the conduct of such businesses, including, without
limitation, source and object codes, developer notes and documentation, manuals
and other user materials, publishing rights with respect thereto and rights to
derivations and modifications thereof, other than such software and data which
is identified in the CVI Disclosure Schedule as being in the public domain
(collectively, the "Proprietary Rights"), free and clear of all Encumbrances.
The foregoing representation as it relates to Third Party Technology is limited
to the interest of CVI and of a CVI Subsidiary pursuant to the Third Party
Licenses, each of which is valid and enforceable and in full force and effect
and which grant CVI or such CVI Subsidiary all such rights to Third Party
Technology as are material to the conduct of its business.

            (b) The CVI Disclosure Schedule contains an accurate description of
(i) all patents, trademarks, service marks, tradenames, and registered
copyrights owned by CVI and the CVI Subsidiaries, all applications and
registration statements therefor, and a list of all licenses and other
agreements relating thereto, and (ii) all licenses and other agreements with
third parties (the "Third Party Licenses") relating to any patents, copyrights,
technology, software, know-how, processes, trade secrets, trademarks, service
marks, tradenames or other proprietary rights that CVI or any CVI Subsidiary is
licensed or otherwise authorized by such third parties to use (such proprietary
rights being collectively referred to as the "Third Party Technology").

            (c) No claim has been asserted against CVI or any CVI Subsidiary
(and to the Knowledge of CVI and the Indemnifying CVI Securityholders there are
no claims that are likely to be asserted) by any person challenging the use by
CVI or any CVI Subsidiary of any patent, trademark, service mark, tradename,
copyright, trade secret, software, technology, know-how or process used by CVI
or any CVI Subsidiary (including without limitation the Third Party Technology)
or challenging or questioning the validity or effectiveness of any license or
agreement relating thereto (including without limitation any Third Party
License).


                                       15


<PAGE>   21


            (d) No use by CVI or any CVI Subsidiary of any of the Proprietary
Rights in its business as currently conducted infringes on the rights of,
constitutes misappropriation of, or in any way involves unfair competition with
respect to, any proprietary information or intangible property right of any
third party, including without limitation any patent, trade secret, copyright,
trademark, service mark or tradename.

            (e) To the Knowledge of CVI and the Indemnifying CVI
Securityholders, no employee of CVI or any CVI Subsidiary is in violation of any
term of any employment contract, non-disclosure agreement or any other contract
or agreement relating to the relationship of such employee with CVI or such CVI
Subsidiary or, to the Knowledge of CVI and the Indemnifying CVI Securityholders,
any other party.

            (f) Each current employee of CVI or any CVI Subsidiary (including
consultants and independent contractors, if any) listed in Section 3.18 of the
CVI Disclosure Schedule has executed and delivered to CVI an agreement
containing confidentiality and non-disclosure provisions in the form previously
provided to counsel for Raytel. To the Knowledge of CVI and the Indemnifying CVI
Securityholders, neither the execution and delivery of any such agreement by any
such person, nor the carrying on by any such person or any other person as an
employee, consultant or independent contractor, as the case may be, of the
business of CVI or any of the CVI Subsidiaries as currently conducted and as
currently anticipated to be conducted has conflicted or will conflict with or
result in a breach of the terms, conditions or provisions of, or constitute a
default under, any contract, covenant or instrument under which any of such
persons is obligated.

        3.11 Employee Benefit Plans.

            (a) CVI has established the Cardiovascular Ventures, Inc. 401(k)
Profit Sharing Plan (the "CVI 401(k) Plan"). The CVI 401(k) Plan has been duly
adopted by CVI and each of the CVI Subsidiaries. The CVI Plan, with respect to
CVI and each CVI Subsidiary, is, and at all times since its inception has been,
a qualified plan under Section 401(a) of the Code. The CVI 401(k) Plan has been
administered by CVI in all material respects in accordance with the terms
thereof. All employee salary deferral contributions made pursuant to the CVI
401(k) Plan have been transferred to the trust established pursuant to the CVI
401(k) Plan in accordance with the applicable law and regulations except those
awaiting deposit in the normal course of business.

            (b) Neither CVI nor any CVI Subsidiary is a party to, participates
in or is obligated to contribute to any "employee welfare benefit plan" as such
term is defined in Section 3(1) of ERISA. Except for the CVI 401(k) Plan,
neither CVI nor any CVI Subsidiary is a party to, participates in or is
obligated to contribute to any "employee pension benefit plan," as such term is
defined in Section 3(2) of ERISA, including, without limitation, any pension,
profit-sharing, retirement, savings, bonus, thrift or stock bonus plan. In
addition, neither CVI nor any CVI Subsidiary is a party to, participates in or
is obligated to contribute to any other deferred compensation, incentive,
vacation, severance pay, group insurance, stock option or other stock-related
employee benefit, or other plan (whether or not written) or arrangement or
understanding of any kind whatsoever providing any material employee benefits
for any or all of the current or former employees or agents of CVI or any CVI
Subsidiary.


                                       16


<PAGE>   22


            (c) Except for the CVI 401(k) Plan, there are no "employee pension
benefit plans," as defined in Section 3(2) of ERISA, (i) in respect of which CVI
or any CVI Subsidiary is an "employer" or a "substantial employer," as defined
in Sections 3(5) and 4001(a)(2), respectively, of ERISA, (ii) with respect to
which CVI or any CVI Subsidiary is a "party in interest" within the meaning of
Section 3(14) of ERISA, or (iii) with respect to which CVI or any CVI Subsidiary
is assuming any liability or will be liable to make contributions to or for the
payment of benefits. Neither CVI nor any CVI Subsidiary is a party to, and none
of its operations is or has ever been covered by, (i) any "multi-employer plan"
as such term is defined in Section 3(37) or Section 4001(a)(3) of ERISA, or (ii)
other pension or retirement payment arrangement, whether or not written,
involving a past or unfunded future cost to CVI or any CVI Subsidiary, whether
or not such plan or arrangement is covered by ERISA.

        3.12 Bank Accounts. The CVI Disclosure Schedule sets forth the names and
locations of all banks, trust companies, savings and loan associations, and
other financial institutions at which CVI and each CVI Subsidiary maintains
accounts of any nature and the names of all persons authorized to draw thereon
or make withdrawals therefrom.

        3.13 Contracts.

            (a) The CVI Disclosure Schedule contains a complete and accurate
list of each contract, agreement or obligation, written or oral, to which CVI or
any CVI Subsidiary is a party:

                       (i) that calls for any fixed and/or contingent payment or
expenditure or any related Series of fixed and/or contingent payments or
expenditures by or to CVI or any CVI Subsidiary totaling more than $25,000 in
any calendar year;

                       (ii) that involves the relationship between CVI or any
wholly-owned CVI Subsidiary and any majority-owned CVI Subsidiary (other than
CVI Equipment Leases and CVI Real Property Leases);

                       (iii) with cardiologists, cardiology groups, hospitals,
referring physicians and third-party payors;

                       (iv) with agents, advisors, sales representatives,
distributors, independent contractors or consultants that are not cancelable by
it on no more than 30 days' notice and without liability, penalty or premium;

                       (v) that restricts CVI or any CVI Subsidiary from
carrying on anywhere in the world its business or any portion thereof as
currently conducted;

                       (vi) to provide funds to or to make any investment in any
other person or entity (in the form of a loan, capital contribution or
otherwise);

                       (vii) for the sale, license or other disposition of any
of its properties or assets, except for transactions entered into in the
ordinary course of business;


                                       17


<PAGE>   23


                       (viii) with respect to obligations as guarantor, surety,
co-signer, endorser, co-maker, indemnitor or otherwise in respect of the
obligation of any other person or entity; or

                       (ix) for any borrowing, line of credit, standby
financing, revolving credit or other similar financing arrangement.

            (b) To the Knowledge of CVI and the Indemnifying CVI
Securityholders, no party to any such contract, agreement or obligation intends
to cancel, withdraw, modify or amend such contract, agreement or obligation.

            (c) Except for the contracts, agreements and obligations referred to
in Section 3.13(a), the CVI Equipment Leases and the CVI Real Property Leases,
neither CVI nor any CVI Subsidiary is a party to or bound by the terms of any
contract, agreement or obligation in any material way affecting its business.

            (d) Neither CVI nor any CVI Subsidiary is in default under or in
breach or violation of, nor is there any valid basis for any claim of default by
CVI or any CVI Subsidiary under, or breach or violation by CVI or any CVI
Subsidiary of, any contract, agreement or obligation to which CVI or any CVI
Subsidiary is a party or by which it or any of its properties or assets is bound
or affected and which in any material way affects its business. To the Knowledge
of CVI and the Indemnifying CVI Securityholders, no other party is in default
under or in breach or violation of, nor, to the Knowledge of CVI and the
Indemnifying CVI Securityholders, is there any valid basis for any claim of
default by any other party under, or any breach or violation by any other party
of, any contract, agreement or obligation to which CVI or any CVI Subsidiary is
a party or by which any of its properties or assets is bound or affected.

            (e) To the Knowledge of CVI and the Indemnifying CVI
Securityholders, there are no material unresolved claims or disputes between CVI
or any CVI Subsidiary and any of its vendors, distributors, representations or
customers including, without limitation, cardiologists, cardiology groups,
hospitals, referring physicians and third-party payors, and none of such persons
has advised CVI of its intention to cease doing business with CVI or any CVI
Subsidiary or modify the terms under which it conducts, such business as a
result of the transactions contemplated hereby or otherwise.

        3.14 Compliance with Law. CVI and each CVI Subsidiary possess all
regulatory consents, authorizations, approvals, licenses and permits required by
Governmental Entities in connection with the conduct of all aspects of their
respective businesses as presently conducted, including, without limitation, all
required provider agreements and other permits and authorizations pertaining to
Medicare and Medicaid reimbursement, except where the lack thereof would not,
individually or in the aggregate, have a Material Adverse Effect on CVI. The
operations of CVI and each CVI Subsidiary are currently being conducted in
compliance with all such consents, authorizations, approvals, licenses and
permits and with all applicable laws, regulations and other requirements of each
Governmental Entity having jurisdiction over CVI or such CVI Subsidiary,
including, without limitation, all laws and regulations pertaining to Medicare
and Medicaid reimbursement, all federal and state laws, rules and regulations
with regard to the 


                                       18


<PAGE>   24

prevention of fraud and abuse and prohibited kickbacks or payments for the
referral of patients, including, but not limited to, the Medicare/Medicaid
anti-kickback statutes (42 U.S.C. Section 1320 a-7b) and the regulations
promulgated thereunder, the limitations on physician referrals contained in the
federal statutes commonly referred to as Stark I and Stark II (42 U.S.C. Section
1395 nn) and the regulations promulgated thereunder, and the provisions of the
Texas anti-kickback statutes (Section 161.091 of the Texas Health and Safety
Code) all applicable statutes and regulations governing the licensure of medical
facilities and the medical personnel providing services at such facilities, all
applicable federal and state laws, regulations and requirements with respect to
proper maintenance of medical records, and all other laws, regulations and
requirements relating to the provision of healthcare services and reimbursement
for such services. Neither CVI nor any CVI Subsidiary has received any (i)
notification of any asserted present or past failure by CVI or any CVI
Subsidiary to comply with such laws, rules or regulations, (ii) written
complaint, inquiry or request for information from any Governmental Entity
relating thereto or (iii) claim, inquiry or request for information from any
Governmental Entity, Medicare carrier, commercial carrier or other third party
payor with regard to any overpayment or potential overpayment of any
reimbursement, and, to the Knowledge of CVI and the CVI Indemnifying CVI
Securityholders, there is no substantial basis for any of the foregoing.

        3.15 Labor Difficulties. To the Knowledge of CVI and the Indemnifying
CVI Securityholders, neither CVI nor any CVI Subsidiary is engaged in any unfair
labor practice or is in violation of any applicable laws respecting employment
and employment practices, terms and conditions of employment, and wages and
hours. There is no unfair labor practice complaint against CVI pending, or to
the Knowledge of CVI and the Indemnifying CVI Securityholders threatened, before
the National Labor Relations Board. There is no strike, labor dispute, slowdown,
or stoppage pending, or to the Knowledge of CVI and the Indemnifying CVI
Securityholders threatened, against CVI or any CVI Subsidiary. To the Knowledge
of CVI and the Indemnifying CVI Securityholders, no union representation
question exists respecting the employees of CVI or any CVI Subsidiary, and to
the Knowledge of CVI and the Indemnifying CVI Securityholders neither CVI nor
any CVI Subsidiary is now or has ever been subject to any union organizing
activities. Neither CVI nor any CVI Subsidiary is or has ever been subject to
any collective bargaining or union agreement, obligation or commitment, written
or oral, with respect to any of its employees or subject to any other agreement,
obligation or commitment, written or oral, with any trade or labor union,
employees' association or similar organization. Neither CVI nor any CVI
Subsidiary has experienced any work stoppage or other labor difficulty. To the
Knowledge of CVI and the Indemnifying CVI Securityholders, (i) the consummation
of the transactions contemplated by the Transaction Documents will not have a
material adverse effect on the relations of CVI or any CVI Subsidiary with their
respective employees, and (ii) none of the employees of CVI or any of the CVI
Subsidiaries intends to leave its employment, whether as a result of the
transactions contemplated by this Agreement or otherwise.

        3.16 Trade Regulation. To the Knowledge of CVI and the Indemnifying CVI
Securityholders, neither CVI nor any CVI Subsidiary has refused to deal with any
customer or other third party for any reason that would constitute a violation
of any applicable antitrust law. No claim has been asserted or threatened
against CVI or any CVI Subsidiary with respect to wrongful termination of any
dealer, distributor or any other marketing entity, discriminatory pricing, price
fixing, unfair competition, false advertising, or any other violation of any
laws or 


                                       19


<PAGE>   25


regulations relating to anti-competitive practices or unfair trade practices of
any kind, and to the Knowledge of CVI and the Indemnifying CVI Securityholders
no specific situation, set of facts, or occurrence provides any basis for any
such claim.

        3.17   Certain Transactions.

            (a) No Affiliate or employee of CVI has any interest in (i) any
material equipment or other property or asset, real or personal, tangible or
intangible, including, without limitation, any of the Proprietary Rights, used
in connection with or pertaining to the business of CVI or any CVI Subsidiary,
(ii) any creditor, supplier, customer, agent, representative, or distributor of
CVI or any CVI Subsidiary, (iii) any entity that competes with CVI or any CVI
Subsidiary, or with which CVI or any CVI Subsidiary is affiliated or has a
business relationship, or (iv) any agreement, obligation or commitment, written
or oral, to which CVI is a party; provided, however, that no Affiliate of CVI or
other person shall be deemed to have such an interest solely by virtue of the
ownership of less than 5% of the outstanding stock or debt securities of any
publicly held company, the stock or debt securities of which are traded on a
recognized stock exchange or quoted on The Nasdaq National Market.

            (b) Except as contemplated by this Agreement, neither CVI nor any
CVI Subsidiary is a party to any (i) agreement with any officer or other
employee of CVI (A) the benefits of which are contingent, or the terms of which
are materially altered, upon the occurrence of a transaction involving CVI in
the nature of any of the transactions contemplated by this Agreement or the
other Transaction Documents, (B) providing any term of employment or
compensation guaranty, or (C) providing severance benefits or other benefits
after the termination of employment of such officer or other employee regardless
of the reason for such termination of employment, or (ii) agreement or plan,
including, without limitation, any stock option plan, stock appreciation right
plan or stock purchase plan, any of the benefits of which will be increased, or
the vesting of benefits of which will be accelerated, by the occurrence of any
of the transactions contemplated by this Agreement or the Other Transaction
Documents or the value of any of the benefits of which will be calculated on the
basis of any of the transactions contemplated by this Agreement or the Other
Transaction Documents.

        3.18 Employees and Consultants. The CVI Disclosure Schedule lists all
agreements with individual employees and consultants to which CVI or any CVI
Subsidiary is a party. True, correct and complete copies of all such written
agreements and written descriptions of all oral agreements have been delivered
to counsel for Raytel. The CVI Disclosure Schedule lists the names of all
employees of CVI or any CVI Subsidiary, together with their salaries or wages,
other compensation and dates of employment and positions.

        3.19 Insurance. The CVI Disclosure Schedule contains a complete and
accurate list of the insurance policies and other forms of insurance held by CVI
and the CVI Subsidiaries. To the Knowledge of CVI and the Indemnifying CVI
Securityholders, neither CVI nor any CVI Subsidiary has done anything, either by
way of action or inaction, that would invalidate any such policy in whole or in
part.


                                       20


<PAGE>   26


        3.20 Litigation. There is no action, proceeding, claim or investigation
pending against CVI or any CVI Subsidiary or affecting any of their properties,
assets or operations before any court or administrative agency, and, to the
Knowledge of CVI and the Indemnifying CVI Securityholders, no such action,
proceeding, claim or investigation is currently threatened. To the Knowledge of
CVI and the Indemnifying CVI Securityholders, there is no substantial basis for
any stockholder or former stockholder of CVI, or any other person, firm,
corporation or entity, to assert a claim against CVI or Raytel based upon (i)
ownership or rights to ownership of any securities of CVI, (ii) any rights of
such person as a CVI Securityholder or (iii) any rights of such person under any
agreement between CVI and any of its stockholders or former stockholders, or
option holders or former option holders in their capacity as such. There is no
judgment, decree, injunction, rule or order of any Governmental Entity
outstanding against CVI or any CVI Subsidiary or, to the Knowledge of CVI and
the Indemnifying CVI Securityholders, affecting any of their respective
properties, assets or operations.

        3.21 Corporate Minutes, Etc. CVI has made available to counsel for
Raytel true, correct and complete copies of (i) its minute book containing
complete records of all proceedings, consents, actions, and meetings of its
stockholders, Board of Directors and any committees thereof, (ii) all permits,
orders, and consents issued by any Governmental Entity with respect to CVI, or
any securities of CVI, and all applications for such permits, orders, and
consents, and (iii) the stock certificate and transfer books and the stock
register of CVI setting forth all issuances and transfers of any capital stock
of CVI. The corporate minute books, stock certificate books, stock registers and
other corporate records of CVI and the copies thereof provided to counsel for
Raytel are complete and accurate in all material respects, and the signatures
appearing on all documents contained therein are the true signatures of the
persons purporting to have signed the same.

        3.22 Compliance with Environmental Requirements. CVI and each CVI
Subsidiary has obtained all permits, licenses and other authorizations required
under federal, state and local laws relating to pollution or protection of the
environment, including laws or provisions relating to emissions, discharges,
releases or threatened releases of pollutants, contaminants, or hazardous or
toxic materials, substances, or wastes into air, surface water, groundwater, or
land, or otherwise relating to the manufacture, processing, distribution, use,
treatment, storage, disposal, transport, or handling of pollutants, contaminants
or hazardous or toxic materials, substances, or wastes, except where the failure
to obtain such permits, licenses or other authorizations would not, individually
or in the aggregate, have a Material Adverse Effect on CVI. CVI and each CVI
Subsidiary is in compliance with all terms and conditions of such permits,
licenses and authorizations, except where non-compliance would not, individually
or in the aggregate, have a Material Adverse Effect on CVI. To the Knowledge of
CVI and the Indemnifying CVI Securityholders, there are no conditions,
circumstances, activities, practices, incidents, or actions which are likely to
form the basis of any claim, action, suit, proceeding, hearing or investigation
against CVI or any CVI Subsidiary based on or related to the unlawful
manufacture, processing, distribution, use, treatment, storage, disposal,
transport, or handling, or the unlawful emission, discharge, release or
threatened release into the environment, of any pollutant, contaminant, or
hazardous or toxic materials, substances or wastes.


                                       21


<PAGE>   27


        3.23 Brokers. Except for amounts payable to Raymond James & Co., as
described in the CVI Disclosure Schedule, CVI is not obligated for the payment
of fees or expenses of any broker, finder or other person in connection with the
origination, negotiation or execution of this Agreement or any of the other
Transaction Documents or in connection with any transaction contemplated hereby
or thereby.

        3.24 CVI Options. The CVI Disclosure Schedule contains a list of all
holders of CVI Options and the number of shares of CVI Common Stock subject to
the CVI Options held by each optionee. All CVI Options that will be outstanding
immediately prior to the Closing have been issued pursuant to option agreements,
copies of which have previously been provided to counsel for Raytel.

        3.25 Disclosure. CVI has delivered to counsel for Raytel a true,
complete and correct copy of each document required by this Article III to be
delivered and has made available to counsel for Raytel a true, complete and
correct copy of each other document referred to or listed in the CVI Disclosure
Schedule.

        3.26 No Existing Discussions. As of the date hereof, CVI is not engaged,
directly or indirectly, in any discussions or negotiations with any other party
with respect to an Acquisition Proposal.

                                   ARTICLE IV
               REPRESENTATIONS AND WARRANTIES OF CVI STOCKHOLDERS

        Except as set forth in the CVI Stockholder Disclosure Schedule, each CVI
Stockholder severally and not jointly represents and warrants to Raytel as
follows:

        4.1 Ownership of Stock; Authority.

            (a) Such CVI Stockholder has good and marketable title, free and
clear of any and all Encumbrances, to all of the CVI Stock, CVI Options and CVI
Warrants listed on Exhibit A hereto as being owned by such CVI Stockholder, and
no other person has any ownership interest or security interest in, or claim on
or to, any of such CVI Stock, such CVI Options or such CVI Warrants. Such CVI
Stockholder has the full right, capacity, power and authority to transfer,
convey and sell to Raytel at the Closing all such CVI Stock, and to cancel and
terminate such CVI Options or CVI Warrants as contemplated herein, and, upon
consummation of the purchase contemplated hereby, Raytel will acquire from such
CVI Stockholder good and marketable title to such CVI Stock, free and clear of
all covenants, conditions, restrictions, voting trust arrangements,
Encumbrances, options and adverse claims or rights whatsoever.

            (b) Such CVI Stockholder has all requisite power, capacity and
authority to execute and deliver the Transaction Documents to which such CVI
Stockholder is a party and to perform such CVI Stockholder's obligations under
such Transaction Documents. Such Transaction Documents have been (or in the case
of the Transaction Documents to be entered into on the Closing Date, shall be
when delivered) duly and validly executed and delivered by such 


                                       22


<PAGE>   28


CVI Stockholder, and each constitutes (or, in the case of the Transaction
Documents to be entered into on the Closing Date, shall constitute) a legal,
valid and binding obligation of such CVI Stockholder, enforceable against such
CVI Stockholder in accordance with its terms.

        4.2 Absence of Violation or Conflicts. Neither the execution and
delivery by such CVI Stockholder of any or all of the Transaction Documents to
which such CVI Stockholder is a party, nor the consummation by such CVI
Stockholder of the transactions contemplated hereby or thereby, will conflict
with, or result in any violation of or default under, or result in the
imposition of any Encumbrance upon any of the CVI Stock, CVI Options or CVI
Warrants owned by such CVI Stockholder, or give rise to a right of termination,
cancellation or acceleration of any obligation, or any right of first refusal or
first option or to the loss of a benefit under, (i) any provision of the
Certificate of Incorporation or By-Laws or other charter documents of such CVI
Stockholder, (ii) any loan or credit agreement, note, bond, mortgage, indenture,
lease, partnership agreement or other agreement, instrument, permit, concession,
franchise or license to which such CVI Stockholder is a party or by which it or
any properties or assets of such CVI Stockholder is bound or affected, or (iii)
any judgment, order, decree, statute, law, ordinance, rule or regulation
applicable to such CVI Stockholder or any properties or assets of such CVI
Stockholder. The consummation of the Acquisition, the transfer to Raytel of all
CVI Stock owned by such CVI Stockholder and the cancellation and termination of
all CVI Options or CVI Warrants owned by such CVI Stockholder will not require
any notice, consent or waiver of any third party.

        4.3 Investment Representations. With respect to any Raytel Shares to be
issued to and acquired by such CVI Stockholder hereunder:

            (a) Such CVI Stockholder will be acquiring Raytel Shares to be
issued to such CVI Stockholder for such CVI Stockholder's own account for
investment only, and not with a view to, or for sale in connection with, any
distribution of such Raytel Shares in violation of the Securities Act or any
rule or regulation under the Securities Act or any state or foreign securities
law.

            (b) Such CVI Stockholder has had adequate opportunity to obtain from
representatives of Raytel such information, in addition to the representations
set forth in this Agreement, as is necessary to evaluate the merits and risks of
the investment by such CVI Stockholder in Raytel.

            (c) Such CVI Stockholder has sufficient experience in business,
financial and investment matters to be able to evaluate the risks involved in
the acquisition of Raytel Shares to be issued to such CVI Stockholder and to
make an informed investment decision with respect to such investment.

            (d) Such CVI Stockholder understands that the Raytel Shares, if and
when issued, will not have been registered under the Securities Act and will be
"restricted securities" within the meaning of Rule 144 under the Securities Act;
and Raytel Shares will not be eligible to be sold, transferred or otherwise
disposed of unless they are subsequently registered under the Securities Act or
an exemption from registration is then available.


                                       23


<PAGE>   29


            (e) A legend substantially in the following form will be placed on
the certificate representing any Raytel Shares which may be issued to such CVI
Stockholder:

               "The shares represented by this certificate have
               not been registered under the Securities Act of
               1933, as amended, and may not be sold, transferred
               or otherwise disposed of in the absence of an
               effective registration statement under such Act or
               an opinion of counsel satisfactory to the
               corporation to the effect that such registration
               is not required."

        4.4 Accredited Investor. If such CVI Stockholder is receiving Raytel
Shares, such CVI Stockholder is an Accredited Investor within the definition of
Rule 501(a) under the Securities Act.

        4.5 Absence of Claims Against CVI. Except as disclosed in the CVI
Stockholder Disclosure Schedule, such CVI Stockholder has no claim against CVI
or any of its Subsidiaries or Affiliates, except for accrued compensation and
benefits and the reimbursement of expenses incurred in the ordinary course of
business. Such CVI Stockholder has no right, claim or interest in or to any
stock or equity ownership interest in CVI other than those referred to in
Section 4.1, and such CVI Stockholder has no right, claim or interest in or to
any of the Proprietary Rights.

        4.6 Litigation. There is no action, proceeding, claim or investigation
pending or, to such CVI Stockholder's knowledge threatened, against such CVI
Stockholder relating to such CVI Stockholder's ownership of CVI Stock before any
Governmental Entity.

        4.7 No Brokers. Such CVI Stockholder is not obligated for the payment of
fees or expenses of any broker or finder in connection with the origination,
negotiation or execution of this Agreement or any of the Transaction Documents
or in connection with any transaction contemplated hereby or thereby.

                                    ARTICLE V
                    REPRESENTATIONS AND WARRANTIES OF RAYTEL

        Raytel represents and warrants to CVI that:

        5.1 Organization and Good Standing. Raytel is a corporation duly
organized, validly existing and in good standing under the laws of the State of
Delaware, and has all requisite corporate power and authority to carry on its
businesses as now conducted. Raytel is duly qualified and licensed to do
business and in good standing in each jurisdiction in which the nature of its
business or properties makes such qualification or licensing necessary, except
where the lack of such qualification or licensing would not have a Material
Adverse Effect on Raytel.

        5.2 Raytel Capitalization.

            (a) The authorized capital stock of Raytel consists of 20,000,000
shares of Raytel Common Stock and 2,000,000 shares of Raytel Preferred Stock. As
of June 30, 1997, 8,402,227 shares of Raytel Common Stock were issued and
outstanding, all of which were duly 


                                       24


<PAGE>   30


authorized, validly issued, fully paid and nonassessable. As of the date of this
Agreement, none of the shares of Raytel Preferred Stock are issued or
outstanding. As of June 30, 1997, Raytel had reserved for issuance approximately
1,728,000 shares of Raytel Common Stock issuable upon the exercise of stock
options granted and outstanding under Raytel's stock option plans and rights
outstanding under Raytel's Employee Stock Purchase Plan. No material change in
such capitalization has occurred between June 30, 1997 and the date of this
Agreement.

            (b) Except for the foregoing, there are no outstanding rights,
options, warrants, conversion rights or other agreements for the purchase or
acquisition from Raytel of any shares of its capital stock or securities
convertible into or exchangeable for any shares of such capital stock.

            (c) The shares of Raytel Common Stock to be issued in the
Acquisition, when issued, will be duly authorized, validly issued, fully paid
and nonassessable.

        5.3 Power, Authorization and Validity.

            (a) Raytel has all requisite corporate right, power, legal capacity
and authority to execute and deliver, and to consummate the transactions
contemplated by, this Agreement and the other Transaction Documents to which it
is or will be a party and to perform its obligations under each of them. The
execution and delivery of, and the consummation of the transactions contemplated
by, this Agreement and each of the other Transaction Documents to which Raytel
is or will be a party has been duly and validly approved and authorized by its
Board of Directors and all other necessary corporate action.

            (b) No consent, approval, order or authorization of, or
registration, declaration or filing with, any Governmental Entity, is required
by or with respect to Raytel in connection with the execution and delivery of,
and the consummation by it of the transactions contemplated by, this Agreement
or any of the other Transaction Documents to which it is or will be a party.

            (c) This Agreement and each of the other Transaction Documents to
which Raytel is or will be a party has been, or upon its execution and delivery
by Raytel will have been, duly executed and delivered by it and constitutes or
will constitute upon its execution and delivery, a valid and binding obligation
of Raytel, enforceable in accordance with its terms.

            (d) The Raytel Shares will be duly and validly issued, fully paid
and nonassessable.

        5.4 Absence of Violations or Conflicts. Neither the execution and
delivery of this Agreement nor the consummation of the transactions contemplated
hereby will conflict with, or result in a breach or violation of, any provision
of the Certificate of Incorporation or By-Laws of Raytel, as currently in
effect, any material instrument or contract to which Raytel is a party or by
which it is bound, or any federal, state or local judgment, writ, decree, order,
statute, rule or regulation applicable to it.


                                       25


<PAGE>   31


        5.5 SEC Filings; Financial Statements.

            (a) Raytel has filed and made available to CVI all forms, reports
and documents required to be filed by Raytel with the SEC since December 31,
1995 other than registration statements on Form S-8 (collectively, the "Raytel
SEC Reports"). The Raytel SEC Reports (i) at the time filed, complied in all
material respects with the applicable requirements of the Securities Act and the
Exchange Act, as the case may be, and (ii) did not at the time they were filed
(or if amended or superseded by a filing prior to the date of this Agreement,
then on the date of such filing) contain any untrue statement of a material fact
or omit to state a material fact required to be stated in such Raytel SEC
Reports or necessary in order to make the statements in such Raytel SEC Reports,
in the light of the circumstances under which they were made, not misleading.
None of Raytel's Subsidiaries is required to file any forms, reports or other
documents with the SEC.

            (b) Each of the consolidated financial statements (including, in
each case, any related notes) contained in the Raytel SEC Reports, including any
Raytel SEC Reports filed after the date of this Agreement until the Closing,
complied or will comply as to form in all material respects with the applicable
published rules and regulations of the SEC with respect thereto, was or will be
prepared in accordance with GAAP applied on a consistent basis throughout the
periods involved (except as may be indicated in the notes to such financial
statements or, in the case of unaudited statements, as permitted by Form 10-Q
promulgated by the SEC) and presented fairly or will present fairly, in all
material respects, the consolidated financial position of Raytel and its
Subsidiaries as of the respective dates and the consolidated results of its
operations and cash flows for the periods indicated, except that the unaudited
interim financial statements were or are subject to normal and recurring
year-end adjustments which were not or are not expected to be material in
amount. The unaudited consolidated balance sheet of Raytel as of March 31, 1997
is referred to herein as the "Raytel Balance Sheet."

            (c) Except as disclosed in the Raytel SEC Reports, Raytel and its
Subsidiaries do not have any liabilities, either accrued or contingent, and
whether due or to become due, which individually or in the aggregate would be
reasonably likely to have a Material Adverse Effect on Raytel, other than (i)
liabilities reflected or provided for on the Raytel Balance Sheet, (ii)
liabilities specifically described in this Agreement, (iii) normal or recurring
liabilities incurred since March 31, 1997 in the ordinary course of business
consistent with past practices, and (iv) liabilities not required by GAAP to be
reflected on a balance sheet.

        5.6 Absence of Certain Changes or Events. Since March 31, 1997, Raytel
has conducted its business in the ordinary course and in a manner consistent
with past practices and, since such date, except as disclosed in the Raytel SEC
Reports, Raytel has not suffered any event or occurrence that has had a Material
Adverse Effect on Raytel.

        5.7 Brokers. Except for financial advisory fees payable to Vector
Securities International, Inc., Raytel is not obligated for the payment of fees
or expenses of any broker or finder in connection with the origination,
negotiation or execution of this Agreement or in connection with any transaction
contemplated hereby.


                                       26


<PAGE>   32


                                   ARTICLE VI
                                COVENANTS OF CVI

        CVI covenants to and agrees with Raytel as follows:

        6.1 Advice of Changes. CVI will promptly notify Raytel in writing of (i)
any event occurring subsequent to the date of this Agreement that would render
any representation or warranty of CVI contained in this Agreement or any of the
other Transaction Documents, if made on or as of the date of that event or the
Closing Date, untrue or inaccurate in any material respect and (ii) any material
adverse change in the business, assets, financial condition or results of
operations of CVI or any of the CVI Subsidiaries.

        6.2 Conduct of Business. During the period from the date of this
Agreement to the Closing, CVI will (and shall cause the CVI Subsidiaries to)
conduct its business in the usual and ordinary course of business in accordance
with past practices. During such period, CVI will use commercially reasonable
efforts to maintain and preserve intact (i) the business organization, rights
and privileges pertinent to its business, (ii) CVI's credit arrangements with
banks, other financial institutions and its creditors, and (iii) CVI's
relationships with its directors, officers, employees, consultants, independent
contractors, licensors, suppliers, distributors and other customers and all
others with whom it deals, all in accordance with its usual and ordinary course
of business. Except as expressly contemplated by this Agreement, CVI shall not
(and shall not permit any of its Subsidiaries to), without the prior written
consent of Raytel:

            (a) Declare or pay any dividends on or make any other distributions
(whether in cash, stock or property) in respect of any of its capital stock or
partnership interests, (other than distributions by the CVI Subsidiaries in the
ordinary course of business consistent with past practice), or split, combine or
reclassify any of its capital stock or issue or authorize the issuance of any
other securities in respect of, in lieu of or in substitution for shares of its
capital stock or partnership interests, or purchase or otherwise acquire,
directly or indirectly, any shares of its capital stock or partnership interests
except from former employees, directors and consultants in accordance with
agreements providing for the repurchase of shares in connection with any
termination of service by such party;

            (b) Issue, deliver or sell or authorize the issuance, delivery or
sale of, any shares of its capital stock or partnership interests or securities
convertible into shares of its capital stock or partnership interests, or
subscriptions, rights, warrants or options to acquire, or other agreements or
commitments of any character obligating it to issue any such securities, other
than the issuance of shares of CVI Common Stock upon the exercise of CVI Options
and CVI Warrants outstanding as of the date of this Agreement;

            (c) Acquire or agree to acquire by merging or consolidating with, or
by purchasing a substantial equity interest in or substantial portion of the
assets of, or by any other manner, any business or any corporation, partnership
or other business organization or division, or otherwise acquire or agree to
acquire any assets other than in the ordinary course of business;


                                       27


<PAGE>   33


            (d) Sell, lease, license or otherwise dispose of or encumber any of
its properties or assets except for transactions entered into in the ordinary
course of business;

            (e) Take any action to (i) increase the compensation payable or to
become payable to any of its officers or employees, (ii) grant any severance or
termination pay to, or enter into any employment or severance agreements with,
any of its officer or employees, (iii) enter into any collective bargaining
agreement, or (iv) establish, adopt, enter into or amend in any material respect
any bonus, profit sharing, thrift, compensation, stock option, restricted stock,
pension, retirement, deferred compensation, employment, termination, severance
or other plan, trust, fund, policy or arrangement for the benefit of any
directors, officers or employees;

            (f) Revalue any of its assets, including writing down the value of
inventory or writing off notes or accounts receivable other than in the ordinary
course of business;

            (g) Incur any indebtedness for borrowed money or guarantee any such
indebtedness or issue or sell any debt securities or warrants or rights to
acquire any debt securities or guarantee any debt securities of others, other
than indebtedness incurred under outstanding lines of credit consistent with
past practice;

            (h) Amend or propose to amend its Certificate of Incorporation or
Bylaws, except as contemplated by this Agreement;

            (i) Incur or commit to incur any individual capital expenditure in
excess of $100,000 or aggregate capital expenditures in excess of $250,000;

            (j) Amend or terminate any material contract, agreement or license
to which it is a party except in the ordinary course of business;

            (k) Waive or release any material right or claim, except in the
ordinary course of business;

            (l) Initiate any litigation or arbitration proceeding;

            (m) Adopt any change in its accounting methods;

            (n) Make or change any tax election, file any tax return, enter into
any closing agreement, settle any tax claim or assessment, surrender any right
to claim refund of taxes, consent to any extension or waiver of the limitation
period applicable to any tax claim or assessment, or take any other action or
omit to take any action, if any such election, adoption or omission would have
the effect of increasing the tax liability of CVI or Raytel; or

            (o) Agree to take any of the actions described in subsections (a)
through (n) above or any other action which is reasonably likely to make any of
CVI's representations or warranties contained in this Agreement untrue or
incorrect in any material respect on the date made or as of the Closing.


                                       28


<PAGE>   34


        6.3 Risk of Loss. Until the Closing, all risk of loss, damage or
destruction to CVI's properties or assets shall be borne by CVI.

        6.4 Access to Information. Until the Closing, CVI will allow Raytel and
its agents free access upon reasonable notice and during normal working hours to
the files, books, records, and offices of CVI and the CVI Subsidiaries,
including, without limitation, any and all information relating to taxes,
commitments, contracts, leases, licenses, Proprietary Rights, personal property
and financial condition. Until the Closing, CVI shall cause its accountants to
cooperate with Raytel and its agents in making available all financial
information reasonably requested, including, without limitation, the right to
examine all working papers pertaining to CVI in the possession, custody or
control of such accountants, subject to the execution by Raytel of a customary
agreement with such accountants with respect to the use of such working papers.

        6.5 Regulatory Approvals. Prior to the Closing, CVI will execute and
file, or join in the execution and filing of, any application or other document
that may be necessary in order to obtain the authorization, approval or consent
of any Governmental Entity that may be reasonably required in connection with
the consummation of the transactions contemplated by this Agreement and the
other Transaction Documents. CVI will use its best efforts to obtain or, as
applicable, to assist Raytel in obtaining all such authorizations, approvals and
consents.

        6.6 Satisfaction of Conditions Precedent. CVI will use its best efforts
to satisfy or cause to be satisfied all the conditions precedent that are set
forth in Sections 10.1 and 10.2 and to cause the Acquisition and the other
transactions contemplated by this Agreement and the other Transaction Documents
to be consummated, and, without limiting the generality of the foregoing, to
obtain all consents and authorizations of third parties and to make all filings
with, and give all notices to, third parties which may be necessary or
reasonably required on its part in order to effect the transactions contemplated
hereby.

        6.7 No Solicitation.

            (a) During the period from the date of this Agreement until the
earlier of the termination of this Agreement or the Closing, CVI shall not,
directly or indirectly, through any officer, director, employee, representative
or agent, (i) solicit, initiate, or encourage any inquiries or proposals that
constitute, or could reasonably be expected to lead to, a proposal or offer for
a merger, consolidation, business combination, sale of substantial assets, sale
of shares of capital stock (including without limitation by way of a tender
offer) or similar transaction involving CVI or any of the CVI Subsidiaries,
other than the transactions contemplated by this Agreement (any of the foregoing
inquiries or proposals being referred to in this Agreement as an "Acquisition
Proposal"), (ii) engage in negotiations or discussions concerning, or provide
any non-public information to any person or entity relating to, any Acquisition
Proposal, or (iii) agree to, approve or recommend any Acquisition Proposal.

            (b) CVI shall notify Raytel no later than 24 hours after receipt by
CVI (or its advisors) of any Acquisition Proposal or any request for nonpublic
information in connection with an Acquisition Proposal or for access to the
properties, books or records of CVI by any person or entity that informs CVI
that it is considering making, or has made, an Acquisition Proposal. Such 


                                       29


<PAGE>   35


notice shall be made orally and in writing and shall indicate in reasonable
detail the identity of the offeror and the terms and conditions of such
proposal, inquiry or contact.

        6.8 CVI 1997 Audited Financials. CVI will cause audits to be conducted
of CVI's consolidated financial statements and the financial statements of each
CVI Venture for the fiscal year ended June 30, 1997 and, as promptly as
practicable following the date of this Agreement, shall deliver to Raytel (i)
CVI's consolidated balance sheet as of June 30, 1997 and its consolidated
statements of revenues and expenses, stockholders' equity and cash flows for the
fiscal year then ended, and (ii) the balance sheet of each CVI Venture as of
June 30, 1997 and their respective statements of revenues and expenses,
partners' capital and cash flows for the fiscal years then ended, in each case
audited and reported upon by Deloitte & Touche LLP, independent certified public
accountants (the "CVI 1997 Audited Financials"). The CVI 1997 Audited Financials
will be prepared using the same accounting policies and procedures as used in
preparing the CVI Financial Statements in prior years.

                                   ARTICLE VII
                          COVENANTS OF CVI STOCKHOLDERS

        Each of the CVI Stockholders covenants and agrees with Raytel as
follows:

        7.1 Advice of Changes. Such CVI Stockholder shall promptly notify Raytel
in writing of any event occurring subsequent to the date of this Agreement that
would render any representation or warranty of such CVI Stockholder contained in
this Agreement or any of the other Transaction Documents, if made on or as of
the date of that event or the Closing Date, untrue or inaccurate in any material
respect.

        7.2 Regulatory Approvals. Prior to the Closing, such CVI Stockholder
will execute and file, or join in the execution and filing of, any application
or other document that may be necessary in order to obtain the authorization,
approval or consent of any Governmental Entity that may be reasonably required
in connection with the consummation of the transactions contemplated by this
Agreement and the other Transaction Documents. Such CVI Stockholder will use its
best efforts to assist CVI and Raytel in obtaining all such authorizations,
approvals and consents.

        7.3 Satisfaction of Conditions Precedent. Such CVI Stockholder will use
its best efforts to assist CVI in satisfying the conditions precedent that are
set forth in Section 10.1 and 10.2 and to cause the transactions contemplated by
this Agreement and the other Transaction Documents to be consummated.

        7.4 Disposition of Securities; Solicitation; Voting; Etc. From and after
the date hereof, and unless this Agreement is terminated in accordance with
Article XI, such CVI Stockholder shall:

            (a) not transfer, sell or assign to any person or entity, or agree
in any manner to transfer, sell or assign to any person or entity, or pledge,
encumber, deposit into a voting trust or grant a proxy with respect to any of
the CVI Stock or CVI Vested Options (or any interest 


                                       30


<PAGE>   36


therein) currently or hereafter owned or controlled by such CVI Stockholder
without the prior written consent of Raytel;

            (b) not solicit or enter into any agreement or arrangement with any
person or entity with respect to any transfer, sale or assignment of any CVI
Stock or CVI Vested Options (or any interest therein), except transfers, sales
or assignments specifically contemplated by this Agreement; and

            (c) vote the shares of CVI Stock currently or hereafter owned or
controlled by such CVI Stockholder against any merger or acquisition other than
the Acquisition, or any consolidation, sale of stock or assets, reorganization,
recapitalization, liquidation or winding up of or other business combination
involving CVI in any case, at every meeting of stockholders of CVI called
therefor and at every adjournment or postponement thereof (or in connection with
any written consent in lieu of a meeting relating to any such transaction).

        7.5 Other Negotiations. During the period from the date of this
Agreement until the earlier of the termination of this Agreement or the Closing,
such CVI Stockholder shall not (i) solicit, initiate or encourage any
Acquisition Proposal, (ii) engage in negotiation or discussions concerning, or
provide any non-public information to any person or entity relating to, any
Acquisition Proposal, or (iii) agree to, approve or recommend any Acquisition
Proposal.

                                  ARTICLE VIII
                               COVENANTS OF RAYTEL

        Raytel hereby covenants and agrees with CVI and the CVI Stockholders as
follows:

        8.1 Advice of Changes. Raytel will promptly notify CVI in writing of any
event occurring subsequent to the date of this Agreement that would render any
representation or warranty of Raytel contained in this Agreement or any of the
other Transaction Documents, if made on or as of the date of that event or the
Closing Date, untrue or inaccurate in any material respect.

        8.2 Regulatory Approvals. Prior to the Closing, Raytel will execute and
file, or join in the execution and filing of, any application or other document
that may be necessary in order to obtain the authorization, approval or consent
of any Governmental Entity that may be reasonably required in connection with
the consummation of the transactions contemplated by this Agreement or the other
Transaction Documents. Raytel will use its best efforts to obtain, or, as
applicable, to assist CVI in obtaining all such authorizations, approvals and
consents.

        8.3 Satisfaction of Conditions Precedent. Raytel will use its best
efforts to satisfy or cause to be satisfied all the conditions precedent that
are set forth in Sections 10.1 and 10.3, and to cause the Acquisition and the
other transactions contemplated by this Agreement and the other Transaction
Documents to be consummated, and, without limiting the generality of the
foregoing, to obtain all consents and authorizations of third parties and to
make all filings with, and give all notices to, third parties which may be
necessary or reasonably required on its part in order to effect the transactions
contemplated hereby.


                                       31


<PAGE>   37


        8.4 Reporting. Between the date hereof and the Closing, and for as long
thereafter as the transfer of any of Raytel Shares is subject to compliance with
Rule 144 under the Securities Act, Raytel shall: (a) file with the SEC in a
timely manner all reports and other documents required to be filed by it under
the Securities Act or the Exchange Act; and (b) so long as a CVI Stockholder
owns any Raytel Shares, furnish to such CVI Stockholder, on request, such
reports and documents so filed by Raytel as such CVI Stockholder may reasonably
request in order to comply with any rule or regulation of the SEC that would
permit the transfer of securities without registration under the Securities Act.

                                   ARTICLE IX
                              ADDITIONAL COVENANTS

        In addition to the foregoing, the parties covenant and agree as follows:

        9.1 Confidentiality. The parties acknowledge that the Confidentiality
Agreement (between CVI and Raytel) is binding upon the parties hereto (including
the CVI Stockholders to the same extent as if they were named as parties
therein) and is in full force and effect. The terms of the Confidentiality
Agreement are incorporated into this Agreement by this reference.

        9.2 Publicity. Neither CVI or any of the CVI Stockholders, on the one
hand, nor Raytel, on the other, shall issue any press release or other public
announcement or communication regarding the transactions contemplated by this
Agreement without the prior approval of the other as to the content thereof,
which approval shall not be unreasonably withheld; provided, however, that the
foregoing shall not be deemed to prohibit any disclosure which, in the
reasonable opinion of counsel for the disclosing party, is required by any
applicable law or by any Governmental Entity. Any disclosure in violation of
this Section 9.2 by either (i) Raytel, or (ii) CVI or the CVI Stockholders,
shall be grounds for termination of this Agreement and the Transaction Documents
by CVI or Raytel, respectively.

        9.3 Employment Matters. At Raytel's request, CVI will use commercially
reasonable efforts to encourage any CVI employees designated by Raytel to
continue in the employment of CVI after the Acquisition.

        9.4 Continuing Cooperation. In case at any time after the Closing any
further action is reasonably necessary or desirable to carry out the purposes of
this Agreement or to vest Raytel with full title to all properties, assets,
rights, approvals, immunities and franchises of CVI, the CVI Stockholders and
the proper officers and directors of each corporation which is a party to this
Agreement shall take all such necessary action.

        9.5    CVI Advisory Council.

            (a) Promptly following the execution of this Agreement, the parties
will establish a committee (the "CVI Advisory Council") consisting of one
representative of Raytel and three representatives of CVI, each of whom will be
a member of CVI's senior management. The initial representative of Raytel shall
be Swapan Sen, and the initial representatives of CVI shall be Ralph Watts, Jack
Thompson and David Wertheimer. Between the date hereof and the 


                                       32


<PAGE>   38


earlier to occur of the termination of this Agreement or the Closing, the CVI
Advisory Council shall meet regularly and not less frequently than four times
per month and shall be kept advised of significant issues known to CVI relating
to the operations of CVI. Minutes of all meetings of the CVI Advisory Council
shall be recorded and shall be subject to review and approval by the
representatives of Raytel.

            (b) The Raytel member of the CVI Advisory Council shall have the
opportunity to make recommendations regarding CVI operating matters, including
the conduct of CVI's development and marketing activities. Notwithstanding the
foregoing, except for those matters specified in Section 6.2 as to which
Raytel's consent is required, all decisions relating to CVI operating matters
shall continue to be made solely by CVI management, and neither Raytel nor its
representative shall have either the authority to direct the management of CVI
or any liability with respect to recommendations which they may make concerning
such matters.

            (c) The approval by the CVI Advisory Council at any meeting thereof,
with the affirmative vote of the Raytel representative after full disclosure of
all material facts, of any action taken or omitted to be taken by CVI shall: (i)
to the extent that such action would constitute or result in a breach of any
representation or warranty of CVI contained in Article III, constitute a waiver
of such breach; and (ii) to the extent that such action would constitute or
result in a breach of any covenant contained in Section 6.2, or require Raytel's
consent pursuant to Section 6.2, constitute such consent and a waiver of any
such breach.

        9.6 Disclaimer of Obligations with Respect to Operation of the Towson
Center. The parties acknowledge that payment of the Raytel Notes is contingent
upon the continuing operation of the cardiac catheterization laboratory (the
"Towson Center") operated by Heart Center of Towson, L.P., a Maryland limited
partnership (the "Partnership"), a Subsidiary of CVI, during the 12-month period
following the Closing and upon the ability of the Partnership to generate
sufficient net cash flow to service certain existing Partnership debt during
such period, of which there is no assurance. The parties acknowledge that the
operation of the Towson Center (as well as all of the other facilities of CVI
and the CVI Subsidiaries) following the Closing shall at all times be subject to
the management control of Raytel and its Subsidiaries, and no provision of this
Agreement or the Raytel Notes shall be construed as limiting such control in any
manner whatsoever or imposing upon Raytel any obligation with respect to the
ongoing operation of the Towson Center. Without limiting the generality of the
foregoing, neither Raytel nor any of its Subsidiaries shall be required
following the Closing to: (i) devote more resources to the operations of the
Towson Center than is, in the opinion of Raytel's management, prudent; (ii) seek
to maximize cash flow from the Towson Center; (iii) continue the operations of
the Towson Center if, in its sole discretion, Raytel's management determines
that it is not prudent to do so; or (iv) continue to maintain its present
ownership interests in the Towson Center.

                                    ARTICLE X
                              CONDITIONS TO CLOSING

        10.1 Conditions to Each Party's Obligations. The respective obligations
of each party to effect the Acquisition and the other transactions to be
performed by such party at the Closing 


                                       33


<PAGE>   39


are, at the option of such party, subject to the satisfaction at or prior to the
Closing of the following conditions:

            (a) No order shall have been entered, and not vacated, by a court or
administrative agency of competent jurisdiction, in any action or proceeding
which enjoins, restrains or prohibits the consummation of the Acquisition or any
of the other transactions contemplated by this Agreement or the other
Transaction Documents.

            (b) There shall be no action, suit or proceeding pending or
threatened by any Governmental Entity or private party in which (i) an
injunction is sought against the Acquisition or any of the other transactions
contemplated by this Agreement or the other Transaction Documents or (ii) relief
is or may be sought against any party hereto as a result of this Agreement and
in which, in the good faith judgment of the Board of Directors of either CVI or
Raytel (relying on the advice of their respective legal counsel), such
Governmental Entity or private party has the probability of prevailing and such
relief would have a material adverse effect upon such party.

            (c) All consents, waivers, permits, approvals or other
authorizations of all Governmental Entities necessary in order to permit
consummation of the Acquisition and the other transactions contemplated by this
Agreement and the other Transaction Documents shall have been obtained and
effected.

            (d) The shares of Raytel Common Stock to be issued in the
Acquisition shall have been approved for quotation on The Nasdaq National
Market.

            (e) Raytel shall have received all permits and other authorizations
required under state blue sky laws for the issuance of shares of Raytel Common
Stock in the Acquisition.

        10.2 Conditions to Obligations of Raytel. The obligations of Raytel to
effect the Acquisition and the other transactions to be performed by it at the
Closing are, at the option of Raytel, subject to the satisfaction at or prior to
the Closing of the following additional conditions:

            (a) All the representations and warranties of CVI, the Indemnifying
CVI Securityholders and the CVI Stockholders set forth in this Agreement shall
be true in all material respects as of the Closing Date with the same force and
effect as if they had been made at the Closing, except for changes contemplated
by this Agreement, and CVI shall have delivered to Raytel certificates to such
effect dated the Closing Date and signed by the Chairman of the Board, President
and Chief Financial Officer of CVI and the Indemnifying CVI Securityholders,
respectively.

            (b) All of the terms, covenants and conditions of this Agreement to
be complied with and performed by CVI, the Indemnifying CVI Securityholders and
the CVI Stockholders at or prior to the Closing Date shall have been duly
complied with and performed in all material respects, and CVI shall have
delivered to Raytel certificates to such effect dated the Closing Date and
signed by the Chairman of the Board, President and Chief Financial Officer of
CVI and the Indemnifying CVI Securityholders, respectively.


                                       34


<PAGE>   40


            (c) There shall have been no material adverse change in the
consolidated financial condition, results of operations, business or properties
of CVI from May 31, 1997, through the Closing Date, other than changes disclosed
in the CVI Disclosure Schedule.

            (d) Ralph Watts and Jack Thompson shall have executed and delivered
to Raytel letter agreements clarifying their existing employment agreements,
dated April 1, 1992 and September 6, 1994, respectively, to the effect that (i)
they will be bound by the provisions of Sections 8 and 9 of such agreements for
a period of 12 months following the termination of such agreements, (ii) said
Sections 8 and 9 will apply to the prospects listed on Exhibit H hereto for a
period of 12 months following the termination of such agreements and (iii)
Raytel will cause the severance payments specified in each of such agreements to
be paid in accordance with the terms of such agreement.

            (e) David Wertheimer, M.D. shall have executed and delivered to
Raytel the Non-Competition Agreement.

            (f) Raytel shall be reasonably satisfied that the manager of each
facility operated by CVI (other than such facility managers specified in the CVI
Disclosure Schedule), all of the physicians employed at each such facility and
not less than 60% of the other employees at each such facility are ready,
willing and able to remain employed by CVI or Raytel after the Acquisition on
terms reasonably satisfactory to Raytel.

            (g) All persons serving as directors or officers of CVI and each of
the CVI Subsidiaries shall have resigned all such positions effective as of the
Closing.

            (h) Raytel shall have received from McGlinchey Stafford, counsel for
CVI, an opinion dated the Closing Date and substantially in the form of Exhibit
F hereto.

            (i) Ralph Watts and Jack Thompson shall have sold to CVI all limited
partnership units in the Heart Center of Central Louisiana, L.P. previously
purchased by them for a purchase price of $10,000 per unit.

            (j) This Agreement shall have been executed and delivered by, and
shall be in full force and effect with respect to, each CVI Stockholder.

            (k) Any and all consents from third parties to CVI's material
contracts and other instruments required to allow the consummation of the
Acquisition and the other transactions contemplated by this Agreement and the
other Transaction Documents shall have been obtained.

            (l) All CVI Stockholders shall have executed and delivered the
Waivers.

            (m) The Escrow Agreement shall have been executed and delivered by
the CVI Representatives.

            (n) Raytel shall have received from the CVI Stockholders all
investment representations and other documents as it shall deem satisfactory to
establish that the Raytel 


                                       35


<PAGE>   41


Shares will be issued in a transaction exempt from registration under the
Securities Act by reason of Section 4(2) thereof.

            (o) Each CVI Stockholder who holds CVI Options shall have executed
and delivered to Raytel a CVI Stockholder Option Cancellation Agreement with
respect to the cancellation of all such CVI Options.

            (p) Each CVI Stockholder who holds CVI Warrants shall have executed
and delivered to Raytel a Warrant Cancellation Agreement with respect to the
cancellation of all such CVI Warrants.

            (q) Each holder of CVI Vested Options who is not a CVI Stockholder
shall have executed and delivered to Raytel a Non-Stockholder Option
Cancellation Agreement with respect to the cancellation of all such CVI Vested
Options, and all other CVI Options held by persons who are not CVI Stockholders
shall have terminated or been cancelled prior to or upon the Closing.

            (r) Raytel shall have obtained the written agreement of DVI
Financial Services, Inc. ("DVI") that all indebtedness of CVI and/or any CVI
Subsidiary to DVI may be prepaid following the Closing on terms reasonably
acceptable to Raytel.

        10.3 Conditions to Obligations of CVI and the CVI Stockholders. The
obligations of CVI and the CVI Stockholders to effect the Acquisition and the
other transactions to be performed by them at the Closing are, at the option of
CVI and the CVI Representatives, subject to the satisfaction at or prior to the
Closing of the following additional conditions:

            (a) All of the representations and warranties of Raytel set forth in
this Agreement shall be true in all material respects on and as of the Closing
Date with the same force and effect as if they had been made at the Closing,
except for changes contemplated by this Agreement, and Raytel shall have
delivered to CVI certificates to such effect dated the Closing Date and signed
by their respective Chief Executive Officer and Chief Financial Officer.

            (b) All of the terms, covenants and conditions of this Agreement to
be complied with and performed by Raytel at or prior to the Closing shall have
been duly complied with and performed in all material respects, and Raytel shall
have delivered to CVI certificates to such effect dated the Closing Date and
signed by their respective Chief Executive Officer and Chief Financial Officer.

            (c) CVI shall have received from Gray Cary Ware & Freidenrich, A
Professional Corporation, counsel for Raytel, an opinion, dated the Closing Date
and substantially in the form of Exhibit G hereto.

            (d) The Escrow Agreement shall have been executed and delivered by
Raytel and the Escrow Agent.


                                       36


<PAGE>   42


                                   ARTICLE XI
                  TERMINATION AND AMENDMENT; FEES AND EXPENSES

        11.1 Termination. This Agreement may be terminated at any time prior to
the Closing (with respect to Sections 11.1(b) through 11.1(g), by written notice
by the terminating party to the other party):

            (a) by the mutual written consent of Raytel and CVI;

            (b) by Raytel by giving notice to CVI and the CVI Stockholders, if
the Acquisition shall not have been consummated by August 15, 1997 (unless the
failure results primarily from a breach by Raytel of any representation,
warranty or covenant contained in this Agreement);

            (c) by CVI and the Stockholder Representative, if the Acquisition
shall not have been consummated by August 15, 1997 (unless the failure results
primarily from a breach by CVI or the CVI Stockholders of any representation,
warranty or covenant contained in this Agreement);

            (d) by either Raytel or CVI, if a court of competent jurisdiction or
other Governmental Entity shall have issued a final order, decree or ruling or
taken any other action, in each case having the effect of permanently
restraining, enjoining or otherwise prohibiting the Acquisition;

            (e) by Raytel, if (i) the Board of Directors of CVI shall have
withdrawn or modified its approval of this Agreement or the Acquisition in a
manner adverse to Raytel or shall have resolved or publicly announced or
disclosed to any third party its intention to do any of the foregoing; (ii) CVI
or any of the CVI Stockholders shall have breached any covenant or agreement
contained in Sections 6.7 or 7.5, or (iii) an unsolicited Acquisition Proposal
shall have been made by any person or persons (other than Raytel and its
Affiliates), and the Board of Directors of CVI shall have recommended such
Acquisition Proposal to the stockholders of CVI or shall have resolved or
publicly announced or disclosed to any third party its intention to recommend or
support such Acquisition Proposal;

            (f) by Raytel, if a material breach of any representation, warranty,
covenant or agreement on the part of CVI or any CVI Stockholder shall have
occurred and such breach is not capable of being cured or, if capable of being
cured, shall not have been cured within 10 business days following delivery of
notice of such breach by Raytel; or

            (g) by CVI, if a material breach of any representation, warranty,
covenant or agreement on the part of Raytel set forth in this Agreement shall
have occurred and such breach is not capable of being cured or, if capable of
being cured, shall not have been cured within 10 days following delivery of
notice of such breach by CVI.

        11.2 Effect of Termination by CVI. In the event of termination of this
Agreement pursuant to Section 11.1, there shall be no liability or obligation on
the part of Raytel, CVI or 


                                       37


<PAGE>   43


their respective officers, directors, shareholders or Affiliates, except as set
forth in Section 11.3 and further except to the extent that such termination
results from the willful breach by a party of any of its representations,
warranties or covenants set forth in this Agreement; provided that, the
provisions of Section 11.3 of this Agreement and the Confidentiality Agreement
shall remain in full force and effect and survive any termination of this
Agreement.

        11.3   Fees and Expenses.

            (a) Except as set forth in this Section 11.3, the parties shall each
pay their own legal, accounting and financial advisory fees and other
out-of-pocket expenses incurred incident to the negotiation, preparation and
carrying out of this Agreement and the transactions herein contemplated. In the
event that the Acquisition is consummated, all legal, accounting and financial
advisory fees and expenses and other out-of-pocket expenses incurred by CVI
incident to the negotiation, preparation and carrying out of this Agreement and
the transactions herein contemplated, including any cash bonus or payment made
to Ralph Watts or Jack Thompson contingent upon consummation of the Acquisition,
shall be borne by the CVI Securityholders (or, at the election of Raytel in its
sole discretion, by Raytel in which case the Total Acquisition Consideration
shall be reduced by an equivalent amount); provided, however, that CVI shall
submit to Raytel a schedule of all such fees and expenses to be incurred through
the Closing not later than two business days prior to the Closing for purposes
of adjusting the amount of the Total Acquisition Consideration by the amount
thereof.

            (b) If this Agreement is terminated by Raytel pursuant to Section
11.1(e) and if prior to 12 months from the date of this Agreement, CVI
consummates, or enters into a definitive agreement to consummate, an Alternative
Transaction, CVI shall pay to Raytel a fee of $2,300,000 (the "Termination Fee")
at or prior to the consummation of such Alternative Transaction, or on or before
the effective date of such definitive agreement, whichever is earlier.

            (c) As used in this Agreement, an "Alternative Transaction" means
(i) a transaction or Series of transactions pursuant to which any person or
group (as such term is defined under the Exchange Act) other than Raytel, or any
Affiliate thereof, (a "Third Party") acquires or would acquire (upon completion
of such transaction or series of transactions) shares (or securities exercisable
for or convertible into shares) representing more than 40% of the outstanding
shares of CVI's voting securities, pursuant to a tender offer or exchange offer
or otherwise, (ii) a merger, consolidation, share exchange or other business
combination involving CVI or any CVI Subsidiary, if, upon consummation of such
merger, consolidation share exchange or other business combination such Third
Party owns or would own more than 40% of the outstanding equity securities of
CVI or any CVI Subsidiary or the entity surviving such merger or business
combination or resulting from such consolidation, (iii) any other transaction or
series of transactions pursuant to which any Third Party acquires or would
acquire (upon completion of such transaction or series of transactions) control
of assets of CVI or any CVI Subsidiary (including, for this purpose, outstanding
equity securities of Subsidiaries of such party) having a fair market value
equal to more than 40% of the fair market value of all the consolidated assets
of CVI immediately prior to such transaction or series of transactions, or (iv)
any transaction or series of transactions pursuant to which any Third Party
acquires or would acquire (upon completion of such transaction or series of
transactions) control of the Board of Directors of CVI 


                                       38


<PAGE>   44


or by which nominees of any Third Party are (or would be) elected or appointed
to a majority of the seats on the Board of Directors of CVI.

            (d) If CVI fails to promptly pay to Raytel any Termination Fee due
hereunder, CVI shall pay the costs and expenses (including reasonable documented
legal fees and expenses) incurred by Raytel in connection with any action,
including the filing of any lawsuit or other legal action, taken to collect
payment thereof, together with interest on the amount of any unpaid fee at the
publicly announced prime rate of Citibank, N.A. from the date such fee was
required to be paid.

                                   ARTICLE XII
           SURVIVAL OF REPRESENTATIONS AND WARRANTIES; INDEMNIFICATION

        12.1 Survival of Representations and Warranties. If the Acquisition
occurs, (i) all of the representations and warranties contained in Article IV
shall survive the Closing Date and (ii) all of the representations and
warranties contained in Article III shall survive the Closing Date for a period
of one year.

        12.2 Indemnification by the Indemnifying CVI Securityholders.

            (a) Subject to the terms and conditions contained herein, each of
the CVI Securityholders identified on Exhibit A as Indemnifying CVI
Securityholders (the "Indemnifying CVI Securityholders") agrees, jointly and
severally, to indemnify, defend and hold harmless Raytel, its stockholders,
officers, directors, employees and attorneys, all Subsidiaries and Affiliates of
Raytel, and the respective officers, directors, employees and attorneys of such
entities (all such persons and entities being collectively referred to as the
"Raytel Group") from, against, for and in respect of (i) any and all losses,
damages, costs and expenses (including reasonable legal fees and expenses) which
any member of the Raytel Group may sustain or incur which are caused by or arise
out of (A) any inaccuracy in or breach of any of the representations, warranties
or covenants made by CVI or the Indemnifying CVI Securityholders in this
Agreement, including the CVI Disclosure Schedule (with the exception of the
representations, warranties and covenants made by the CVI Stockholders in
Article IV and Article VII) or (B) any breach by the Indemnifying CVI
Securityholders of their obligations under this Article XII (collectively, the
"Raytel CVI-Related Losses") or (ii) any and all costs and expenses (including
reasonable legal fees and expenses) incurred by Raytel, CVI or any Raytel
Subsidiary in applying for and obtaining from the Internal Revenue Service a
favorable determination letter with respect to the CVI 401(k) Plan and any
taxes, fees and penalties payable in connection therewith (collectively, the
"CVI 401(k) Expenses").

            (b) No Indemnifying CVI Securityholder shall be required to
indemnify any member of the Raytel Group for any Raytel CVI-Related Losses until
the aggregate amount of all Raytel CVI-Related Losses under all claims shall
exceed $50,000 (the "Floor"); provided, however, that if the aggregate amount of
Raytel CVI-Related Losses in respect of such claims exceeds the Floor, the
Indemnifying CVI Securityholders shall indemnify such member or members of the
Raytel Group for all such Raytel CVI-Related Losses (including the initial
$50,000 in respect of such claims) subject to the further limitations set forth
herein. Claims for 


                                       39


<PAGE>   45


CVI 401(k) Expenses shall be neither subject to the Floor nor included as claims
for purposes of determining whether the Floor has been exceeded.

            (c) The Indemnifying CVI Securityholders shall not be required to
indemnify any member of the Raytel Group for Raytel CVI-Related Losses and/or
CVI 401(k) Expenses in excess of an aggregate of $500,000 (the "Cap"); provided
that the Cap shall not apply to Raytel CVI-Related Losses arising out of the
breach of any representation or warranty contained in Section 3.1, 3.2, 3.3,
3.4, 3.5, 3.14, 3.20, 3.23 or 3.24.

            (d) All claims for indemnification under this Section 12.2 shall
first be asserted against the Escrow Amount pursuant to the Escrow Agreement. No
such claims may be asserted against the Escrow Amount following the earlier of
(i) the date which is 60 days after the delivery to Raytel of the CVI 1997
Audited Financials or (ii) November 30, 1997.

            (e) The obligation of the Indemnifying CVI Securityholders to
indemnify members of the Raytel Group for a Raytel CVI-Related Loss or CVI
401(k) Expenses under this Section 12.2 is subject to the condition that, during
the term of the Escrow Agreement, the CVI Representatives shall have received a
claim for such Raytel CVI-Related Loss or such CVI 401(k) Expenses and,
thereafter, such Indemnifying CVI Securityholder shall have received a claim for
such Raytel CVI-Related Loss prior to one year following the Closing Date.

            (f) The provisions of Sections 12.2(b), (c), (d) and (e) and 12.8
shall not limit, in any manner, any remedy at law or in equity to which any
member of the Raytel Group shall be entitled against CVI or any Indemnifying CVI
Securityholder as a result of fraud or intentional misrepresentation by CVI or
any Indemnifying CVI Securityholder or any of their respective representatives
or agents.

        12.3 Indemnification by the CVI Stockholders.

            (a) Subject to the terms and conditions contained herein, each of
the CVI Stockholders agrees, severally and not jointly, to indemnify, defend and
hold harmless Raytel and all other members of the Raytel Group from, against,
for and in respect of any and all losses, damages, costs and expenses (including
reasonable legal fees and expenses) which any member of the Raytel Group may
sustain or incur which are caused by or arise out of any inaccuracy in or breach
of any of the representations, warranties or covenants made by such CVI
Stockholder in Article IV or Article VII (collectively, the "Raytel CVI
Stockholder-Related Losses" and, together with the Raytel CVI-Related Losses and
the CVI 401(k) Expenses, the "Raytel Losses").

            (b) No CVI Stockholder shall be required to indemnify any member of
the Raytel Group for Raytel CVI Stockholder-Related Losses in excess of the
value of the Total Acquisition Consideration received by such CVI Stockholder in
the Acquisition.

            (c) The provisions of Section 12.3(b) shall not limit, in any
manner, any remedy at law or in equity to which any member of the Raytel Group
shall be entitled against any CVI Stockholder as a result of fraud or
intentional misrepresentation by such CVI Stockholder or any of such CVI
Stockholder's representatives or agents.


                                       40


<PAGE>   46


        12.4 Indemnification by Raytel.

            (a) Subject to the terms and conditions contained herein, Raytel
agrees to indemnify, defend and hold harmless CVI and its officers, directors,
employees and attorneys, all Subsidiaries and Affiliates of CVI, the CVI
Stockholders and the respective officers, directors, employees and attorneys of
such entities (all such persons and entities being collectively referred to as
the "CVI Group") from and against all losses, damages, costs and expenses
(including reasonable legal fees and expenses) which any member of the CVI Group
may sustain or incur which are caused by or arise out of any inaccuracy in or
breach of any of the representations, warranties or covenants made by Raytel in
this Agreement (collectively, the "CVI Losses").

            (b) The obligation of Raytel to indemnify members of the CVI Group
is subject to the condition that Raytel shall have received a claim for such CVI
Loss prior to the expiration of one year following Closing Date.

            (c) The provisions of Section 12.4(b) shall not limit, in any
manner, (i) any claim by any member of the CVI Group against Raytel for any
breach of any covenant or agreement of Raytel to be performed by Raytel
following the Closing; or (ii) any remedy at law or in equity to which any
member of the CVI Group shall be entitled against Raytel as a result of fraud or
intentional misrepresentation by Raytel or any of its representatives or agents.

        12.5 Procedures for Indemnification.

            (a) As used in this Article XII, the term "Indemnitor" means the
party or parties against whom indemnification hereunder is sought, and the term
"Indemnitee" means the party or parties seeking indemnification hereunder.

            (b) A claim for indemnification hereunder (an "Indemnification
Claim") shall be made by Indemnitee by delivery of a written notice to
Indemnitor (in the case of a Raytel CVI-Related Claim or CVI 401(k) Expenses,
the notice shall be delivered to the CVI Representatives during the term of the
Escrow Agreement and thereafter to the Indemnifying CVI Securityholders from
whom indemnity is sought) requesting indemnification and specifying the basis on
which indemnification is sought in reasonable detail (and shall include relevant
documentation related to the Indemnification Claim), the amount of the asserted
Raytel Losses or CVI Losses, as the case may be, and, in the case of a Third
Party Claim (as defined in Section 12.6), containing (by attachment or
otherwise) such other information as Indemnitee shall have concerning such Third
Party Claim.

            (c) If the Indemnification Claim involves a Third Party Claim, the
procedures set forth in Section 12.6 hereof shall be observed by Indemnitee and
Indemnitor.

        12.6 Defense of Third Party Claims. Should any claim be made or any suit
or proceeding instituted by a third party against Indemnitee which, if
prosecuted successfully, would be a matter for which Indemnitee would be
entitled to indemnification under this Article XII (a "Third Party Claim"), the
obligations and liabilities of the parties hereunder with respect to such Third
Party Claim shall be subject to the following terms and conditions:


                                       41


<PAGE>   47


            (a) Indemnitee shall give Indemnitor written notice of any such
Third Party Claim promptly after receipt by Indemnitee of notice thereof, and
Indemnitor will undertake control of the defense thereof by counsel of its own
choosing reasonably acceptable to Indemnitee. Indemnitee may participate in the
defense through its own counsel at its own expense. If Indemnitor fails or
refuses to undertake the defense of such Third Party Claim within 15 days after
written notice of such claim has been delivered to Indemnitor by Indemnitee,
Indemnitee shall have the right to undertake the defense, compromise and,
subject to Section 12.7, settlement of such Third Party Claim with counsel of
its own choosing. In the circumstances described in the preceding sentence,
Indemnitee shall, promptly upon its assumption of the defense of such Third
Party Claim, make an Indemnification Claim as specified in Section 12.7(a) which
shall be deemed an Indemnification Claim that is not a Third Party Claim for the
purposes of the procedures set forth herein. Failure of Indemnitee to furnish
written notice to Indemnitor of a Third Party Claim shall not release Indemnitor
from Indemnitor's obligations hereunder, except to the extent Indemnitor is
prejudiced by such failure.

            (b) Indemnitee and Indemnitor shall cooperate with each other in all
reasonable respects in connection with the defense of any Third Party Claim,
including making available records relating to such claim and furnishing
employees of Indemnitee as may be reasonably necessary for the preparation of
the defense of any such Third Party Claim or for testimony as witness in any
proceeding relating to such claim.

        12.7 Settlement of Third Party Claims. Unless Indemnitor has failed to
fulfill its obligations under this Article XII, no settlement by Indemnitee of a
Third Party Claim shall be made without the prior written consent by or on
behalf of Indemnitor, which consent shall not be unreasonably withheld or
delayed. If Indemnitor has assumed the defense of a Third Party Claim as
contemplated by Section 12.6(a), no settlement of such Third Party Claim may be
made by Indemnitor without the prior written consent by or on behalf of
Indemnitee, unless such settlement includes a complete release of all claims
against Indemnitee. Upon any settlement of a Third Party Claim against a member
of the Raytel Group in accordance with this Section 12.7, the parties shall
instruct the Escrow Agent to release funds from escrow, to the extent available,
to effect such settlement.

        12.8 Manner of Indemnification.

            (a) To provide a fund against which members of Raytel Group may
assert claims of indemnification under this Article XII, the Escrow Amount shall
be withheld and deposited into escrow pursuant to the Escrow Agreement pursuant
to the provisions of Section 2.6. The Escrow Amount so deposited into escrow
shall be held and distributed in accordance with the Escrow Agreement.

            (b) Claims for indemnification asserted against the Indemnifying CVI
Securityholders with respect to Raytel CVI-Related Claims and CVI 401(k) Plan
Expenses shall be made first in accordance with the Escrow Agreement until the
termination of the Escrow Agreement, subject to the provisions of Section
12.2(e).


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<PAGE>   48


        12.9 CVI Representatives; Power of Attorney.

            (a) The CVI Representatives shall be appointed by and shall
constitute the agents and attorneys-in-fact of each CVI Securityholder, for and
on behalf of such CVI Securityholder: to execute the Escrow Agreement; to give
and receive notices and communications thereunder; to authorize delivery to
Raytel of funds from the escrow in satisfaction of claims by Raytel in respect
to Raytel CVI-Related Losses; to object to such deliveries; to agree to,
negotiate, enter into settlements and compromises of, and commence arbitration
and comply with orders of courts and awards of arbitrators with respect to such
claims which may be satisfied from the Escrow Amount; and to take all actions
necessary or appropriate in the judgment of the CVI Representatives for the
accomplishment of the foregoing. A CVI Representative may resign upon 30 days
prior written notice to the parties to this Agreement, the other CVI
Representatives and the Escrow Agent. Any CVI Representative may be replaced by
the Indemnifying CVI Securityholders from time to time upon not less than five
days prior written notice to Raytel and the Escrow Agent; provided that no CVI
Representative may be replaced unless Indemnifying CVI Securityholders holding a
majority in interest of the Escrow Amount agree to such replacement. In the
event that any of the CVI Representatives dies, becomes unable to perform his
responsibilities hereunder or resigns from such position, a majority in interest
of the Indemnifying Securityholders shall select another representative to fill
such vacancy and such substituted representative shall be deemed to be one of
the CVI Representatives for all purposes of this Agreement. Any successor CVI
Representatives shall have all of the power, authority, rights and privileges
conferred by this Agreement upon the original CVI Representatives, and the term
"CVI Representatives" as used herein shall be deemed to include any successor
CVI Representatives. No bond shall be required of the CVI Representatives, and
the CVI Representatives shall receive no compensation for their services. During
the term of the Escrow Agreement, notices or communications to or from the CVI
Representatives shall constitute notice to or from each of the Indemnifying CVI
Securityholders, as appropriate.

            (b) The CVI Representatives shall not be liable for their service in
such capacity to Raytel or the Indemnifying CVI Securityholders for any act done
or omitted hereunder as CVI Representative while acting in good faith and in the
exercise of reasonable judgment, and any act done or omitted pursuant to the
advice of counsel shall be evidence of such good faith. The Indemnifying CVI
Securityholders shall jointly and severally indemnify the CVI Representative and
hold the CVI Representatives harmless against, any loss, liability or expense
incurred without bad faith on the part of the CVI Representatives and arising
out of or in connection with the acceptance or administration of the CVI
Representatives' duties hereunder.

            (c) A decision, act, consent or instruction of or by both of the CVI
Representatives then serving (or the sole CVI Representative, if only one CVI
Representative shall then be in office) shall constitute the decision, act or
consent or instruction of all the Indemnifying CVI Securityholders with respect
to the Escrow Amount, and shall be final, valid, binding and conclusive upon
each of the Indemnifying CVI Securityholders, and the Escrow Agent and Raytel
may rely upon any decision, act, consent or instruction of the CVI
Representatives as being the decision, act, consent or instruction of each and
all of the Indemnifying CVI Securityholders with respect to the Escrow Amount.
The Escrow Agent and Raytel are hereby relieved from any liability to any person
for any acts done by them with respect 


                                       43
<PAGE>   49


to the Escrow Amount in accordance with such decision, act, consent or
instruction of the CVI Representatives. Although the CVI Representatives shall
not be obligated to obtain instructions from the Indemnifying CVI
Securityholders prior to any decision, act, consent or instruction, if, and to
the extent that, the CVI Representatives receives any written instructions from
the Indemnifying CVI Securityholders holding a majority in interest of the
Escrow Amount, the CVI Representatives shall comply with such instructions.

                                  ARTICLE XIII
                                   ARBITRATION

        13.1 Scope. The parties hereto agree that any claim, controversy,
dispute or disagreement between or among any of the parties to this Agreement
arising out of or relating to this Agreement (including, without limitation, any
Indemnification Claim) or relating to the computation of principal and/or
interest payable under any Raytel Note or the timing of such payment (a
"Dispute") shall be governed exclusively by the terms and provisions of this
Article XIII; provided, however, that the terms and provisions of this Article
XIII shall not preclude any party hereto from seeking, or a court of competent
jurisdiction from granting, a temporary restraining order, temporary injunction
or other equitable relief for any breach of (i) the Confidentiality Agreement or
the Non-Competition Agreement or (ii) any other duty, obligation, covenant,
representation or warranty the breach of which may cause irreparable harm or
damage.

        13.2 Informal Dispute Resolution. In the event of any Dispute, either
party shall deliver to the other party or parties written notice of such Dispute
(which, in the case of an indemnification claim, shall be the Indemnification
Claim specified in Section 12.4(b)). Within 14 days after such written notice is
given, one or more principals of each party involved in the Dispute shall meet
at a mutually agreeable location for the purpose of determining whether they can
resolve the Dispute themselves and, if not, whether they can agree upon an
impartial arbitrator to whom to submit the Dispute for arbitration.

        13.3 Arbitration. If the parties are unable to resolve the Dispute
within 30 days after the delivery of the notice pursuant to Section 13.2, the
Dispute shall be submitted for arbitration to the arbitrator that the parties
have agreed upon. If the parties fail to agree upon an arbitrator, Raytel and
CVI shall each select one arbitrator, and the two arbitrators so selected shall
select a third arbitrator who is experienced in the subject matter of such
Dispute. If such Dispute involves healthcare issues, the arbitrator so selected
shall have such qualifications as would satisfy the requirements of the National
Health Lawyers Association Alternative Dispute Resolution Service. Each of the
arbitrators shall be impartial and independent of all parties to this Agreement.
If either of the parties fails to select an arbitrator within 20 days after the
end of such 30-day period, or if the arbitrators chosen by the parties fail to
select a third arbitrator within 20 days after their selection, any party may in
writing request the judge of the United States District Court for the Northern
District of California senior in term of service to appoint an arbitrator. The
arbitrator agreed upon by the parties or so selected (the "Presiding
Arbitrator") shall have sole and complete jurisdiction over the arbitration.


                                       44


<PAGE>   50


        13.4   Applicable Rules and Procedure.

            (a) Each arbitration hearing relating to a Dispute shall be held at
a place in San Mateo County, California acceptable to the Presiding Arbitrator.
Each such arbitration shall be conducted in accordance with the Commercial
Arbitration Rules of the American Arbitration Association to the extent such
rules do not conflict with the terms of this Article XIII.

            (b) The decision of the Presiding Arbitrator shall be reduced to
writing and shall be binding on the parties.

            (c) Judgment upon the award(s) rendered by the Presiding Arbitrator
may be entered and execution had in any court of competent jurisdiction, or
application may be made to such court for a judicial acceptance of the award and
an order of enforcement.

            (d) The charges and expenses of the arbitrators shall be shared
equally by the parties to the arbitration.

            (e) The arbitration shall commence within 10 days after the
Presiding Arbitrator is selected in accordance with the provisions of this
Article XIII. In fulfilling his or her duties with respect to determining any
amount at issue in a Dispute, the Presiding Arbitrator may consider such matters
as, in the opinion of the Presiding Arbitrator, may be necessary or helpful to
make a proper valuation. The Presiding Arbitrator may consult with and engage
disinterested third parties to advise the Presiding Arbitrator. The Presiding
Arbitrator shall add an interest factor reflecting the time value of money to
the amount of any monetary award and shall not award any punitive or exemplary
damages.

            (f) If a Presiding Arbitrator selected hereunder should die, resign
or be unable to perform his or her duties hereunder, unless the parties agree
upon a replacement Presiding Arbitrator, the two original arbitrators selected
by the parties or the senior judge who selected such Presiding Arbitrator (or
such judge's successor) shall select a replacement Presiding Arbitrator.

            (g) As to any determination of the amount at issue in a Dispute, or
as to the resolution of any other claim or controversy at issue in a Dispute, no
lawsuit based on such Dispute shall be instituted by any of Raytel Parties or
the CVI Parties, other than to compel arbitration proceedings hereunder or to
enforce the award of the Presiding Arbitrator.

            (h) All privileges under Delaware and federal law, including
attorney-client and work-product privileges, shall be preserved and protected to
the same extent that such privileges would be protected in a federal court
proceeding applying Delaware law. The rules of evidence under the Federal Rules
of Civil Procedure shall apply to all arbitration proceedings conducted pursuant
to this Article XIII.

            (i) The parties shall have the right to conduct and enforce
pre-hearing discovery in accordance with the then current Federal Rules of Civil
Procedure, subject to the following limitations:


                                       45


<PAGE>   51


                       (i) Each party may serve no more than one set of
interrogatories; and

                       (ii) Each party may depose the other party's expert
witnesses who will be called to testify at the hearing, plus two fact witnesses
without regard to whether they will be called to testify (each party will be
entitled to a total of not more than 24 hours of depositions of the other
party's witnesses).

            (j) Document discovery and other discovery shall be under the
control of and enforceable by the Presiding Arbitrator. Discovery disputes shall
be decided by the Presiding Arbitrator. The Presiding Arbitrator is empowered
to:

                       (i) issue subpoenas to compel pre-hearing document or
deposition discovery;

                       (ii) enforce the discovery rights and obligations of the
parties; and

                       (iii) otherwise to control scheduling and conduct the
proceedings.

Notwithstanding anything to the contrary herein, the Presiding Arbitrator shall
have the power and authority to, and to the fullest extent practicable shall,
abbreviate arbitration discovery in a manner which is fair to all parties in
order to expedite the conclusion of each arbitration proceeding.

            (k) The arbitration hearing shall be conducted so as to preserve its
privacy and to allow reasonable procedural due process. The parties hereto will
maintain the substance of any proceedings hereunder in confidence and the
arbitrators, prior to any proceedings hereunder, will sign an agreement whereby
the arbitrators agree to keep the substance of any proceedings hereunder in
confidence.

                                   ARTICLE XIV
                                  MISCELLANEOUS

        14.1 Governing Law. It is the intention of the parties hereto that the
internal laws of the State of Delaware (irrespective of its choice of law
principles) shall govern the validity of this Agreement, the construction of its
terms, and the interpretation and enforcement of the rights and duties of the
parties hereto.

        14.2 Assignment; Binding upon Successors and Assigns. None of the
parties hereto may assign any of its rights or obligations hereunder without the
prior written consent of the other parties. This Agreement will be binding upon
and inure to the benefit of the parties hereto and their respective successors
and permitted assigns.

        14.3 Severability. In the event that any provision of this Agreement, or
the application thereof, shall for any reason and to any extent be held to be
invalid or unenforceable, the remainder of this Agreement and the application of
such provision to other persons or circumstances shall be interpreted so as best
to reasonably effect the intent of the parties hereto. The parties further agree
to replace such invalid or unenforceable provision of this Agreement 


                                       46
<PAGE>   52


with a valid and enforceable provision which will achieve, to the extent
possible, the economic, business and other purposes of the invalid or
unenforceable provision.

        14.4 Entire Agreement. This Agreement, the exhibits hereto, the
documents referenced herein, and the exhibits thereto, constitute the entire
understanding and agreement of the parties hereto with respect to the subject
matter hereof and thereof and supersede all prior and contemporaneous agreements
or understandings, inducements or conditions, express or implied, written or
oral, between the parties with respect hereto and thereto, including without
limitation, the letter of intent dated June 13, 1997 entered into between Raytel
and CVI.

        14.5 Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall constitute an original and all of which
together shall constitute one and the same instrument.

        14.6 Other Remedies. Except as otherwise provided herein, any and all
remedies herein expressly conferred upon a party shall be deemed cumulative with
and not exclusive of any other remedy conferred hereby or by law on such party,
and the exercise of any one remedy shall not preclude the exercise of any other.

        14.7 Waiver. Any party hereto may, by written notice to the others: (i)
waive any of the conditions to its obligations hereunder or extend the time for
the performance of any of the obligations or actions of the others; (ii) waive
any inaccuracies in the representations of the others contained in this
Agreement or in any documents delivered pursuant to this Agreement; (iii) waive
compliance with any of the covenants of the others contained in this Agreement;
or (iv) waive or modify performance of any of the obligations of the others. No
action taken pursuant to this Agreement, including without limitation any
investigation by or on behalf of any party, shall be deemed to constitute a
waiver by the party taking such action of compliance with any representation,
warranty, condition or agreement contained herein. Waiver of the breach of any
one or more provisions of this Agreement shall not be deemed or construed to be
a waiver of other breaches or subsequent breaches of the same provisions.

        14.8 Notices. All notices and other communications hereunder will be in
writing and will be deemed given (i) upon receipt if delivered personally (or if
mailed by registered or certified mail), (ii) on the day after dispatch if sent
by overnight courier, or (iii) upon dispatch if transmitted by facsimile (and
confirmed by a copy delivered in accordance with clause (i) or (ii)), addressed
to the parties at the following addresses:

        CVI:                 Cardiovascular Ventures, Inc.
                             336 Camp Street, Suite 250
                             New Orleans, Louisiana  70130
                             Facsimile:  (504) 571-2188
                             Attention: David Wertheimer, M.D.
                                    Chairman


                                       47


<PAGE>   53


        with a copy to:      McGlinchey Stafford
                             643 Magazine Street
                             New Orleans, Louisiana  70130
                             Facsimile:  (504) 596-2800
                             Attention: James Fantaci, Esq.

        The CVI
        Stockholders or
        the CVI
        Indemnifying
        Securityholders:     c/o The CVI Representatives at their address set 
                             forth under their signatures

        Raytel:              Raytel Medical Corporation
                             2755 Campus Drive, Suite 200
                             San Mateo, California 94403-2515
                             Facsimile: (650) 349-8850
                             Attention: Richard F. Bader
                                        Chairman and Chief Executive Officer

        with a copy to:      Gray Cary Ware & Freidenrich
                             400 Hamilton Avenue
                             Palo Alto, California 94301
                             Facsimile:  (650) 327-3699
                             Attention:  Dennis C. Sullivan, Esq.

Any party may change its address for such communications by giving notice
thereof to the other parties in conformity with this Section 14.8.

        14.9   Construction and Interpretation of Agreement.

            (a) This Agreement has been negotiated by the respective parties
hereto and their attorneys and the language hereof shall not be construed for or
against any party. The table of contents and headings herein are for reference
purposes only and shall not in any manner affect the meaning or interpretation
of this Agreement.

            (b) When a reference is made in this Agreement to an Article or a
Section, such reference shall be to an Article or Section of this Agreement
unless otherwise indicated. Whenever the words "include," "includes" or
"including" are used in this Agreement, they shall be deemed to be followed by
the words "without limitation." The phrase "made available" in this Agreement
shall mean that the information referred to has been made available if requested
by the party to whom such information is to be made available. The phrases "the
date of this Agreement," "the date hereof," and terms of similar import, unless
the context otherwise requires, shall be deemed to refer to August 11, 1997.


                                       48


<PAGE>   54


            (c) As used in this Agreement, any reference to any state of facts,
event, change or effect being "material" with respect to any entity means a
state of facts, event, change or effect, as the case may be, that is material to
the current or expected condition (financial or otherwise), properties, assets,
liabilities, business, operations or prospects of such entity.

            (d) As used in this Agreement, the term "Knowledge of CVI and the
Indemnifying CVI Securityholders" means the actual knowledge of any of the
directors or officers of CVI or any of the Indemnifying CVI Securityholders
after inquiry of Lora Compton and Lynn Hoyson at CVI's Heart and Family
Institute.

            (e) Whenever the term "enforceable in accordance with its terms" or
like expression is used, it is understood that excepted therefrom are any
limitations on enforceability under applicable bankruptcy, insolvency,
reorganization, moratorium or other laws of general application affecting the
enforcement of creditor's rights.

        14.10 No Joint Venture. Nothing contained in this Agreement, including
but not limited to the provisions of Section 9.6, shall be deemed or construed
as creating a joint venture or partnership between any of the parties hereto. No
party is by virtue of this Agreement authorized as an agent, employee or legal
representative of any other party. No party shall have the power to control the
activities and operations of any other and their status is, and at all times,
will continue to be, that of independent contractors with respect to each other.
No party shall have any power or authority to bind or commit any other. No party
shall hold itself out as having any authority or relationship in contravention
of this Section 14.10.

        14.11 Specific Performance. Each of the parties acknowledges and agrees
that one or more of the other parties would be damaged irreparably in the event
any of the provisions of this Agreement are not performed in accordance with
their specific terms or otherwise are breached. Accordingly, each of the parties
agrees that the other parties shall be entitled to an injunction or injunctions
to prevent breaches of the provisions of this Agreement and to enforce
specifically this Agreement and the terms and provisions hereof in any action
instituted in any court having jurisdiction over the parties and the matter, in
addition to any other remedy to which it may be entitled, at law or in equity.

        14.12 Further Assurances. Each party agrees to cooperate fully with the
other parties and to execute such further instruments, documents and agreements
and to give such further written assurances, as may be reasonably requested by
any other party to better evidence and reflect the transactions described herein
and contemplated hereby and to carry into effect the intents and purposes of
this Agreement.

        14.13 Absence of Third Party Beneficiary Rights. No provisions of this
Agreement are intended, nor shall be interpreted, to provide or create any third
party beneficiary rights or any other rights of any kind in any customer,
affiliate, stockholder or partner of any party hereto or any other person or
entity unless specifically provided otherwise herein, and, except as so
provided, all provisions hereof shall be solely between the parties to this
Agreement.


                                       49


<PAGE>   55


        IN WITNESS WHEREOF, the parties hereto have execute this Agreement as of
the date first set forth above.

                                 RAYTEL MEDICAL CORPORATION



                                 By:  /s/ RICHARD F. BADER
                                    -------------------------------------------
                                 Title:  Chairman & Chief Executive Officer


                                 CARDIOVASCULAR VENTURES, INC.


                                 By:  /s/ DAVID WERTHEIMER, M.D.
                                    -------------------------------------------
                                 Title:  Chairman


                                 CVI REPRESENTATIVES


                                   /s/ DAVID WERTHEIMER
                                 ----------------------------------------------
                                 David Wertheimer, M.D.


                                   /s/ ROBERT FINZI
                                 ----------------------------------------------
                                 Robert Finzi



                                 CVI STOCKHOLDERS

                                 [Counterpart Signature pages for each of the
                                 CVI Stockholders are attached].


                                       50


<PAGE>   56

                           COUNTERPART SIGNATURE PAGE

  Stock Purchase Agreement between Raytel Medical Corporation, Cardiovascular
                  Ventures, Inc., and the Stockholders of CVI


                                 CVI STOCKHOLDERS:

                                   Sprout Capital VI, L.P.
                                 ----------------------------------------------
                                 Name

                                 By:  DLJ Capital Corporation
                                    -------------------------------------------
                                 Its:  Managing General Partner
                                     ------------------------------------------

                                   /s/ RICHARD E. KROON
                                 ----------------------------------------------
                                 Signature


                                   DLJ Venture Capital Fund II, L.P.
                                 ----------------------------------------------
                                 Name

                                 By:  DLJ  Fund Associates II

                                 Its:  General Partner

                                   /s/ RICHARD E. KROON
                                 ----------------------------------------------
                                 Signature


                                   DLJ Capital Corporation
                                 ----------------------------------------------
                                 Name

                                   /s/ RICHARD E. KROON
                                 ----------------------------------------------
                                 Signature


                                       51


<PAGE>   57


                                  Menlo Ventures IV, L.P.
                                 ----------------------------------------------
                                 Name

                                 By:  MV Management IV, L.P.
                                    -------------------------------------------
                                 Its:  General Partner
                                     ------------------------------------------
                                   /s/ H. O. MONTGOMERY
                                 ----------------------------------------------
                                 Signature


                                   Equus II Incorporated
                                 ----------------------------------------------
                                 Name

                                   /s/ NOLAN LEHMAN
                                 ----------------------------------------------
                                 Signature


                                   Premier Venture Capital Corporation II
                                 ----------------------------------------------
                                 Name

                                   /s/ THOMAS J. ADAMEK
                                 ----------------------------------------------
                                 Signature


                                   Louisiana Fund Corporation
                                 ----------------------------------------------
                                 Name

                                   /s/ THOMAS J. ADAMEK
                                 ----------------------------------------------
                                 Signature


                                   Bernard Kurecki
                                 ----------------------------------------------
                                 Name

                                   /s/ BERNARD KURECKI
                                 ----------------------------------------------
                                 Signature


                                   Ira Pearlstine
                                 ----------------------------------------------
                                 Name

                                   /s/ IRA PEARLSTINE
                                 ----------------------------------------------
                                 Signature

                                       52


<PAGE>   58


                                   Bharat Upadhyay
                                 ----------------------------------------------
                                 Name

                                   /s/ BHARAT UPADHYAY
                                 ----------------------------------------------
                                 Signature


                                   Kenneth Friedman
                                 ----------------------------------------------
                                 Name

                                   /s/ KENNETH FRIEDMAN
                                 ----------------------------------------------
                                 Signature

                                   Susan Friedman
                                 ----------------------------------------------
                                 Name (if jointly owned)

                                   /s/ SUSAN FRIEDMAN
                                 ----------------------------------------------
                                 Signature


                                   Dr. David Wertheimer
                                 ----------------------------------------------
                                 Name

                                   /s/ DAVID WERTHEIMER
                                 ----------------------------------------------
                                 Signature


                                   Mark Greenberg
                                 ----------------------------------------------
                                 Name

                                   /s/ MARK GREENBERG
                                 ----------------------------------------------
                                 Signature


                                   Marlene Wertheimer
                                 ----------------------------------------------
                                 Name

                                   /s/ MARLENE WERTHEIMER
                                 ----------------------------------------------
                                 Signature


                                       53


<PAGE>   59


                                   Michele Fredman
                                 ----------------------------------------------
                                 Name

                                   /s/ MICHELE FREDMAN
                                 ----------------------------------------------
                                 Signature


                                   Neil Fredman
                                 ----------------------------------------------
                                 Name

                                   /s/ NEIL FREDMAN
                                 ----------------------------------------------
                                 Signature


                                   Mark Borchelt
                                 ----------------------------------------------
                                 Name

                                   /s/ MARK BORCHELT
                                 ----------------------------------------------
                                 Signature


                                   Larry Oliver
                                 ----------------------------------------------
                                 Name

                                   /s/ LARRY OLIVER
                                 ----------------------------------------------
                                 Signature


                                   Lee Mitchell, M.D.
                                 ----------------------------------------------
                                 Name

                                   /s/ LEE MITCHELL, M.D.
                                 ----------------------------------------------
                                 Signature


                                   Craig Paul, M.D.
                                 ----------------------------------------------
                                 Name

                                   /s/ CRAIG PAUL, M.D.
                                 ----------------------------------------------
                                 Signature


                                       54


<PAGE>   60


                                   Enrique Blanco, M.D.
                                 ----------------------------------------------
                                 Name

                                   /s/ ENRIQUE BLANCO, M.D.
                                 ----------------------------------------------
                                 Signature


                                   Robert J. Norton, M.D.
                                 ----------------------------------------------
                                 Name

                                   /s/ ROBERT J. NORTON, M.D.
                                 ----------------------------------------------
                                 Signature


                                   Ralph J. Watts
                                 ----------------------------------------------
                                 Name

                                   /s/ RALPH J. WATTS
                                 ----------------------------------------------
                                 Signature


                                   Nasim Akhtar
                                 ----------------------------------------------
                                 Name

                                   /s/ NASIM AKHTAR
                                 ----------------------------------------------
                                 Signature


                                   Phil Lobstein, M.D.
                                 ----------------------------------------------
                                 Name

                                   /s/ PHIL LOBSTEIN, M.D.
                                 ----------------------------------------------
                                 Signature


                                       55


<PAGE>   61


                                    EXHIBIT B

                                ESCROW AGREEMENT

        This Escrow Agreement (this "Agreement") is entered into as of August
15, 1997 by and among Raytel Medical Corporation, a Delaware corporation
("Raytel"), David Wertheimer, M.D. and Robert Finzi (collectively, the "CVI
Representatives") on behalf of the persons listed on Attachment A hereto
(collectively with their heirs, successors and assigns, the "Indemnifying CVI
Securityholders") and First Trust of California, N.A. (the "Escrow Agent").

                                    RECITALS

        WHEREAS, Raytel, Cardiovascular Ventures, Inc., a Delaware corporation
("CVI"), and the holders (the "CVI Stockholders") of all of the outstanding
shares of CVI capital stock (the "CVI Stock") have entered into a Stock Purchase
Agreement dated as of August 11, 1997 (the "Stock Purchase Agreement"), pursuant
to which, among other things, Raytel has agreed to purchase from the CVI
Stockholders all of the CVI Stock;

        WHEREAS, the Stock Purchase Agreement provides that an escrow account
will be established to secure the indemnification obligations of the
Indemnifying CVI Securityholders under the Stock Purchase Agreement on the terms
and conditions set forth herein;

        WHEREAS, pursuant to Section 12.9 of the Stock Purchase Agreement, each
Indemnifying CVI Securityholder has authorized the CVI Representatives to
execute this Agreement on behalf of such Indemnifying CVI Stockholder; and

        WHEREAS, the parties hereto desire to establish the terms and conditions
pursuant to which such escrow account will be established and maintained;

        NOW, THEREFORE, the parties hereto hereby agree as follows:

        Section 1. Defined Terms. Capitalized terms used in this Agreement and
not otherwise defined shall have the meanings given them in the Stock Purchase
Agreement.

        Section 2. Escrow and Indemnification.

            (a) Deposit of Cash into Escrow. At the Closing, Raytel will deposit
$500,000 (the "Escrow Amount") into an interest-bearing escrow account with the
Escrow Agent to be held pursuant to the terms of this Agreement. The Escrow
Amount and any interest received by the Escrow Agent on account thereof, shall
be held as a trust fund and shall not be subject to any lien, attachment,
trustee process or any other judicial process of any creditor of any party
hereto or any of such party's Affiliates or any of the Indemnifying CVI
Securityholders. The Escrow Agent agrees to accept delivery of the 


                                       1
<PAGE>   62


Escrow Amount and to hold the Escrow Amount in an escrow account (the "Escrow
Account"), subject to the terms and conditions of this Agreement.

            (b) Indemnification. The Indemnifying CVI Securityholders have
agreed, pursuant to the provisions of Article XII of the Stock Purchase
Agreement, jointly and severally, to indemnify, defend and hold harmless the
Raytel Group from and against Raytel CVI-Related Losses and CVI 401(k) Expenses
(together the "Escrow Losses"). The Escrow Account shall be security for the
foregoing obligations of the Indemnifying CVI Securityholders, subject to the
limitations, and in the manner provided, in this Agreement and the Stock
Purchase Agreement.

            (c) Investment of Escrow Amount; Interest. Funds held in the Escrow
Account may be invested by the Escrow Agent in U.S. Treasury Securities and
repurchase agreements, federally insured certificates of deposit, and short-term
commercial paper or money market funds. Any interest earned on such investments
(collectively with the Escrow Amount, the "Escrow Funds") shall be paid to the
Escrow Agent or its nominee and all such interest shall be considered part of
the Escrow Account for purposes hereof.

            (d) Transferability. The respective interests of the Indemnifying
CVI Securityholders in the Escrow Funds and any other property comprising the
Escrow Account shall not be assignable or transferable, other than by operation
of law. Written notice of any such assignment or transfer by operation of law
shall be given to the Escrow Agent and Raytel by the CVI Representatives or
their legal counsel, and no such assignment or transfer shall be valid until
such notice is given.

        Section 3. Administration of Escrow Account for Indemnification Claims.
The Escrow Agent shall administer the Escrow Account in connection with the
indemnification provisions of Article XII of the Stock Purchase Agreement, and
as follows:

            (a) If (i) any member of the Raytel Group has incurred or suffered
Raytel CVI-Related Losses for which it believes in good faith it is entitled to
indemnification under the Stock Purchase Agreement or (ii) Raytel, CVI or any
Raytel subsidiary has incurred any CVI 401(k) Expenses (Raytel, CVI, any such
Raytel subsidiary or any such member of the Raytel Group being referred to
herein as an "Indemnified Person"), the Indemnified Person shall, prior to the
earlier of (i) 60 days after the date of the delivery (in the manner provided
for the sending of notices pursuant to this Agreement) to Raytel of the CVI 1997
Audited Financials or (ii) November 30, 1997 (the "Termination Date") with
respect to each such claim, give written notice of such claim (a "Claim Notice")
to the CVI Representatives and the Escrow Agent. Each Claim Notice shall state
the amount of claimed Escrow Losses (the "Claimed Amount") 


                                       2


<PAGE>   63


and shall set forth in reasonable detail, to the extent then ascertainable, the
basis for such claim and such Claimed Amount.

            (b) No Indemnifying CVI Stockholder shall be required to indemnify
any member of the Raytel Group for any Raytel CVI-Related Losses until the
aggregate of all Raytel CVI-Related Losses under all claims shall exceed $50,000
(the "Floor"); provided, however, that if the aggregate amount of Raytel
CVI-Related Losses in respect of such claims exceeds the Floor, the Indemnifying
CVI Securityholders shall indemnify any member or members of the Raytel Group
for all such Raytel CVI-Related Losses (including the initial $50,000 in respect
of such claims), subject to the further limitations set forth herein and in
Article XII of the Stock Purchase Agreement. Claims for CVI 401(k) Expenses
shall be neither subject to the Floor nor included as claims for purposes of
determining whether the Floor has been exceeded.

            (c) Claims for indemnification (other than those by the Escrow
Agent) shall be made in accordance with the procedures set forth in the Stock
Purchase Agreement and the provisions of this Section 3. Within 20 calendar days
(such 20 day period, the "Response Period") following the date a Claim Notice is
sent, the CVI Representatives shall deliver (in the manner provided for the
sending of notices pursuant to this Agreement) to the Indemnified Person, with a
copy to the Escrow Agent, a written response (the "Response Notice") in which
the CVI Representatives shall: (i) agree that Escrow Funds equal to the full
Claimed Amount may be released from the Escrow Account to the Indemnified
Person, (ii) agree that Escrow Funds equal to part, but not all, of the Claimed
Amount (the "Agreed Amount") may be released from the Escrow Account to the
Indemnified Person, or (iii) contest that any of the Escrow Funds may be
released from the Escrow Account to the Indemnified Person. The CVI
Representatives may contest the release of Escrow Funds only based upon a good
faith belief that the Indemnified Person is not entitled to indemnification for
all or such portion of such amount under the Stock Purchase Agreement. If no
Response Notice is delivered by the CVI Representatives within such 20-day
period, the CVI Representatives shall be deemed to have agreed that Escrow Funds
equal to all of such Claimed Amount may be released to the Indemnified Person
from the Escrow Account.

            (d) If the CVI Representatives in the Response Notice agree (or are
deemed to have agreed) that Escrow Funds equal to all of such Claimed Amount may
be released from the Escrow Account to the Indemnified Person, the Escrow Agent
shall, promptly following either (i) the delivery of the Response Notice or (ii)
if no Response Notice is delivered within the Response Period, the expiration of
the Response Period, disburse to the Indemnified Person Escrow Funds equal to
the Claimed Amount (or such lesser amount of Escrow Funds as is then held in the
Escrow Account).


                                       3


<PAGE>   64


            (e) If the CVI Representatives in the Response Notice agree that
Escrow Funds equal to part, but not all, of the Claimed Amount may be released
from the Escrow Account to the Indemnified Person, the Escrow Agent shall,
promptly following the delivery of the Response Notice, disburse to the
Indemnified Person Escrow Funds equal to the Agreed Amount (or such lesser
amount of Escrow Funds as is then held in the Escrow Account).

            (f) If the CVI Representatives in the Response Notice contest the
release of Escrow Funds in satisfaction of all or part of the Claimed Amount
(the "Contested Amount"), the CVI Representatives and the Indemnified Person
shall attempt promptly and in good faith to agree upon the rights of the parties
with respect to the Contested Amount. If the CVI Representatives and the
Indemnified Person so agree, a memorandum setting forth such agreement shall be
prepared and signed by both parties and delivered to the Escrow Agent and, if
such agreement provides that all or a portion of the Contested Amount is to be
paid to the Indemnified Person, the Escrow Agent shall promptly disburse to the
Indemnified Person from the Escrow Account an amount of Escrow Funds equal to
the amount so agreed (or such lesser amount of Escrow Funds as is then held in
the Escrow Account). If after good faith negotiation no such agreement can be
reached within 15 calendar days after the date the Request Notice is sent (or
such longer period as the Indemnified Person and the CVI Representatives may
mutually agree), the matter shall be settled by binding arbitration in
accordance with Article XIII of the Stock Purchase Agreement.

            (g) After delivery of a Response Notice that the Claimed Amount is
contested by the CVI Representatives, the Escrow Agent shall continue to hold in
the Escrow Account an amount of Escrow Funds sufficient to cover the Contested
Amount (up to the amount of Escrow Funds then available in the Escrow Account),
notwithstanding the occurrence of the Termination Date, until (i) delivery of a
copy of a settlement agreement executed by the Indemnified Person and the CVI
Representatives setting forth instructions to the Escrow Agent as to the release
of Escrow Funds, if any, that shall be made with respect to the Contested Amount
or (ii) delivery of a copy of the final award of the Presiding Arbitrator
setting forth instructions to the Escrow Agent as to the release of Escrow
Funds, if any, that shall be made with respect to the Contested Amount. The
Escrow Agent shall thereupon release Escrow Funds from the Escrow Account (up to
the amount of Escrow Funds then available in the Escrow Account) in accordance
with such agreement or instructions and disburse any remaining Escrow Funds in
accordance with Section 4.

            (h) If, as a result of any third-party claim or legal proceeding
giving rise to Raytel CVI-Related Losses and subject to the indemnification
procedures set forth in Article XII of the Stock Purchase Agreement, any
settlement has been entered into or 


                                       4


<PAGE>   65


any judgment has been entered in favor of any third party (which is not subject
to further appeal) in accordance with Article XII of the Stock Purchase
Agreement, the Indemnified Person may give notice of the resulting Raytel
CVI-Related Losses to the Escrow Agent, together with a copy of the settlement
or judgment and the Escrow Agent shall, promptly following the receipt of such
notice, disburse to the Indemnified Person an amount of Escrow Funds equal to
such Raytel CVI-Related Losses (up to the amount of Escrow Funds then available
in the Escrow Account).

        Section 4. Release of Escrow Funds.

            (a) Subject to the provisions of paragraph (b) below, within 15 days
after the Termination Date, the Escrow Agent shall deliver to the Indemnifying
CVI Securityholders the Escrow Funds then held in escrow, apportioned in
accordance with paragraph (c) below.

            (b) Notwithstanding the foregoing, if on the Termination Date an
Indemnified Person has previously given any Claim Notices that have not then
been resolved in accordance with Section 3, the Escrow Agent shall retain in the
Escrow Account after the Termination Date an amount of Escrow Funds equal to the
aggregate Claimed Amount covered by all such Claim Notices that have not then
been resolved. Any Escrow Funds so retained in escrow shall be disbursed in
accordance with the terms of the resolution of such claims as set forth in
Section 3.

            (c) Any distribution of all or a portion of the Escrow Funds to the
Indemnifying CVI Securityholders shall be made in accordance with the
percentages set forth opposite such holders' respective names on Attachment A
hereto. Distributions to the Indemnifying CVI Securityholders shall be made by
mailing checks to such holders at their respective addresses shown on Attachment
A (or such other address as may be provided in writing to the Escrow Agent by
any such holder).

        Section 5. Fees and Expenses of the Escrow Agent. Raytel and, on behalf
of the Indemnifying CVI Securityholders, the CVI Representatives hereby agree,
jointly and severally, to pay to the Escrow Agent its fees and expenses, as set
forth in Attachment B, in accepting and performing its appointment as escrow
agent hereunder. As between themselves, Raytel, on the one hand, and the
Indemnifying CVI Securityholders, on the other hand, hereby agree that each
shall pay (a) one-half of the fees of the Escrow Agent for the services to be
rendered by the Escrow Agent hereunder and (b) one-half of any fees and expenses
of counsel and other reasonable, actual or documented out-of-pocket expenses
reasonably incurred by the Escrow Agent in the performance of its duties
hereunder. The Escrow Agent may deduct one-half of the fees of the Escrow Agent
due upon inception of the Escrow Fund from the Escrow Amount as initially
deposited, thus reducing the Escrow Funds; such amount shall represent the
portion of such fees allocated to the Indemnifying CVI Securityholders.
Furthermore, in releasing any 


                                       5


<PAGE>   66


amounts of the Escrow Funds hereunder, the Escrow Agent may deduct therefrom and
pay to itself the amount of any outstanding fees and expenses payable to it
pursuant to the terms of this Agreement.

        Section 6. General Terms and Standards Regarding the Escrow Agent.
Notwithstanding any terms of this Agreement to the contrary, each term of this
Agreement, including without limitation each of the stated duties and
responsibilities of the Escrow Agent set forth herein, shall be subject to the
following terms and conditions:

            (a) The duties, responsibilities and obligations of the Escrow Agent
shall be limited to those expressly set forth in this Agreement (and the duty to
exercise reasonable care in the physical safekeeping of any property held in
escrow hereunder), and no implied duties, responsibilities or obligations shall
be read into this Agreement against the Escrow Agent. Without limiting the
generality of the foregoing, the Escrow Agent shall have no duty to take action
to preserve or exercise rights in any property held by it hereunder (including
without limitation against prior parties or otherwise).

            (b) The Escrow Agent shall not be subject to, bound by, charged with
notice of or be required to comply with or interpret any agreement or document
between or among the other parties to this Agreement (whether or not reference
to any such other agreement or documents is expressed herein) other than this
Agreement and Articles XII and XIII of the Stock Purchase Agreement.

            (c) The Escrow Agent shall in no instance be under any duty to give
any property held by it hereunder any greater degree of care than it gives its
own similar property. All amounts received by the Escrow Agent (and any credits
to the Escrow Account) shall be conditional upon collection (and actual receipt
by the Escrow Agent of final payment). In no event shall the Escrow Agent have
any obligation to advance funds.

            (d) The Escrow Agent may rely upon, and shall be protected in acting
or refraining from acting upon, any written notice, instruction, statement,
request, waiver, order, judgment, certification, consent, receipt or other paper
or document furnished to it (not only as to genuineness, but also as to its due
execution and validity, the genuineness of signatures appearing thereon and as
to the truth and accuracy of any information therein contained), which it in
good faith believes to be genuine and signed or represented by the proper
person.

            (e) Neither the Escrow Agent nor any of its directors, officers or
employees shall be liable to anyone for any error of judgment, or for any act
done or step taken or omitted to be taken by it or any of its directors,
officers or employees, or for any mistake of fact or law, or for anything which
it, or any of its directors, officers or employees, may do or refrain from doing
in connection with or in the administration of this Agreement, unless and except
to the extent the same constitutes gross negligence, bad faith or willful
misconduct on the part of the Escrow Agent. In no event shall the Escrow 


                                       6


<PAGE>   67


Agent be liable for any indirect, punitive, special or consequential damages, or
any amount in excess of the value of the Escrow Funds (as of the date of the
action or omission giving rise to liability).

            (f) The Escrow Agent may consult with, and obtain advice from, legal
counsel (including without limitation in-house counsel) with respect to any
question as to any of the provisions hereof or its duties hereunder, or any
matter relating hereto, and the opinion of such counsel shall be full and
complete authorization and protection in respect of any action reasonably taken,
suffered or omitted by the Escrow Agent in good faith in accordance with the
opinion and directions of such counsel.

            (g) The Escrow Agent shall not be deemed to have notice of any fact,
claim or demand with respect hereto unless actually known by an officer charged
with responsibility for administering this Agreement or unless in writing
received by the Escrow Agent and making specific reference to this Agreement.

            (h) No provision of this Agreement shall require the Escrow Agent to
expend or risk its own funds, or to take any legal or other action hereunder
which might in its judgment involve it in, or require it to incur in connection
with the performance of its duties hereunder, any expense or any financial
liability unless it shall be furnished with indemnification acceptable to it.

            (i) Any permissive right of the Escrow Agent to take any action
hereunder shall not be construed as a duty.

            (j) All indemnifications contained in this Agreement shall survive
the resignation or removal of the Escrow Agent, and shall survive the
termination of this Agreement.

            (k) The Escrow Agent is not responsible for the recitals appearing
in this Agreement. The recitals shall be deemed to be statements of Raytel and
the CVI Representatives on behalf of the Indemnifying CVI Securityholders.

            (l) The Escrow Agent has no responsibility for the sufficiency of
this Agreement for any purpose. Without limiting the foregoing, if any security
interest is referred to herein, the Escrow Agent shall have no responsibility
for, and makes no representation or warranty as to, the creation, attachment or
perfection of any such security interest or the sufficiency of this Agreement
therefor.

            (m) Nothing in this Agreement shall obligate the Escrow Agent to
qualify to do business or act in any jurisdiction in which it is not presently
qualified to do business, or be deemed to impose upon the Escrow Agent the
duties of a trustee. The duties of the Escrow Agent under this Agreement are
strictly ministerial in nature.


                                       7


<PAGE>   68


            (n) In no event shall the Escrow Agent have any liability for any
failure or inability of any of the other parties to perform or observe his or
its duties under the Agreement, or by reason of a breach of this Agreement by
any of the other parties. In no event shall the Escrow Agent be obligated to
take any action against any of the other parties to compel performance
hereunder.

            (o) The Escrow Agent shall in no instance be obligated to commence,
prosecute or defend any legal proceedings in connection herewith. The Escrow
Agent shall be authorized and entitled, however, in any instance to commence,
prosecute or defend any legal proceedings in connection herewith, including,
without limitation, any proceeding it may deem necessary to resolve any matter
or dispute, to obtain a necessary declaration of rights, or to appoint a
successor upon resignation (and after failure by the other parties to appoint a
successor, as provided in Section 11).

            (p) Whenever the terms hereof call for any notice, payment or other
action on a day which is not a business day, such payment or action may be
taken, or such notice given, as the case may be, on the next succeeding business
day. As used herein, "business day" shall mean any day other than a Saturday or
Sunday, or any other day on which the Escrow Agent is closed for business.

            (q) In the event of any ambiguity or uncertainty under this
Agreement, or in any notice, instruction or other communication received by the
Escrow Agent hereunder, the Escrow Agent may, in its reasonable discretion,
refrain from taking action, and may retain the Escrow Funds, until and unless it
receives written instruction signed by Raytel and the CVI Representatives, or a
decision by a court of competent jurisdiction or a Presiding Arbitrator which
eliminates such uncertainty or ambiguity.

            (r) If at any time the Escrow Agent is served with any judicial or
administrative order, judgment, decree, writ or other form of judicial
administrative process which in any way relates to or affects the Escrow Funds
(including, but not limited to, orders of attachment or garnishment or other
forms of levies or injunctions or stays relating to the Escrow Funds), the
Escrow Agent is authorized to comply therewith in any manner as it or its legal
counsel reasonable deems appropriate; and if the Escrow Agent complies with any
such judicial or administrative order, judgment, decree, writ or other form of
judicial or administrative process, the Escrow Agent shall not be liable to any
of the parties hereto or to any other person or entity notwithstanding that
though such order, judgment, decree, writ or process may be subsequently
modified, annulled, set aside, vacated, found to have been without proper
jurisdiction, or otherwise determined to have been without legal force or
effect.

            (s) The Escrow Agent shall have no liability for the actions or
omissions of any transfer agent, book-entry depository, nominee, correspondent,
subagent or subcustodian, except to the extent that such action or omission of
any transfer agent, 


                                       8


<PAGE>   69


book-entry depository, nominee, correspondent, subagent or subcustodian was
caused by the Escrow Agent's own gross negligence, bad faith or willful
misconduct.

            (t) The Escrow Agent shall not be responsible for transmitting any
communication received by it as holder of the Escrow Amount to the Indemnifying
CVI Securityholders or any other party, other than the CVI Representatives, or
for notifying any of said persons, other than the CVI Representatives (in
accordance with the notice and copy provisions of Section 10), of any right or
the receipt of distributions or other amounts, with respect to the Escrow Amount
or any other property held in the Escrow Account.

        Section 7. Indemnification.

            (a) General. Each of Raytel and the Indemnifying CVI
Securityholders, jointly and severally, hereby covenants and agrees to indemnify
the Escrow Agent for, and to defend and hold harmless the Escrow Agent from and
against, any and every loss, liability, damage, claim, cost and expense of any
nature incurred or suffered by the Escrow Agent and arising out of or in
connection with this Agreement or the administration of this Agreement or the
performance or observance by the Escrow Agent of its responsibilities or
services under this Agreement (including, but not limited to, attorneys' fees
and other costs and expenses of defending or preparing to defend against any
claim or liability or of advising the Escrow Agent as to its duties hereunder),
unless and except to the extent such loss, liability, damage, cost or expense
shall be caused by the Escrow Agent's own willful misconduct, bad faith or gross
negligence.

            (b) Tax-Related. Solely for the benefit of the Escrow Agent (and
without prejudice to any liability as between Raytel and the Indemnifying CVI
Securityholders or as among the Indemnifying CVI Securityholders), each of
Raytel and the Indemnifying CVI Securityholders, jointly and severally, agrees
to assume any and all obligations imposed now or hereafter by any applicable tax
law with respect to the payment of Escrow Funds under this Agreement, and,
without limiting the generality of Section 8(a) above, hereby agrees to
indemnify and hold the Escrow Agent harmless from and against any taxes,
additions for late payment, interest, penalties and other expenses, that may be
assessed against the Escrow Agent on any such payment or other activities under
this Agreement. Raytel and the CVI Representatives undertake to instruct the
Escrow Agent in writing with respect to any actions that may be required by the
Internal Revenue Code of 1986, as amended, as to withholding and other taxes,
assessments or other governmental charges, certifications and governmental
reporting in connection with this Agreement. Solely for the benefit of the
Escrow Agent (and without prejudice to any liability as between Raytel and the
Indemnifying CVI Securityholders or as among the Indemnifying CVI
Securityholders), each of Raytel and the Indemnifying CVI Securityholders,
jointly and severally, agrees to indemnify and hold the Escrow Agent harmless
from any liability on account of taxes, assessments or other governmental 


                                       9


<PAGE>   70


charges, including, without limitation, the withholding or deduction or the
failure to withhold or deduct same, and any liability for failure to obtain
proper certifications or to properly report to governmental authorities, to
which the Escrow Agent may be or become subject in connection with or which
arises out of this Agreement, including costs and expenses (including reasonable
legal fees), interest and penalties. The other parties shall each promptly
provide the Escrow Agent with appropriate Internal Revenue Service Forms W-9 for
taxpayer identification number certifications, or Forms W-8 for non-resident
alien certifications in connection with any payments to be made to them.

        Section 8. Authority of CVI Representatives; Successors and Assignees.

            (a) Any CVI Representative may be replaced by the Indemnifying CVI
Securityholders from time to time upon not less than five business days prior
written notice to Raytel and the Escrow Agent; provided that no CVI
Representative may be replaced unless Indemnifying CVI Securityholders holding a
majority in interest of the Escrow Amount agree to such replacement. In the
event that any of the CVI Representatives dies, becomes unable to perform his
responsibilities hereunder or resigns from such position, Indemnifying CVI
Securityholders holding a majority in interest of the Escrow Amount shall select
another representative to fill such vacancy. Any such substituted representative
shall be deemed to be one of the CVI Representatives for all purposes of this
Agreement. Any successor CVI Representatives shall have all of the power,
authority, rights and privileges conferred by this Agreement upon the original
CVI Representatives, and the term "CVI Representatives" as used herein shall be
deemed to include any successor CVI Representatives.

            (b) In the event of disagreement among the CVI Representatives, the
decision, agreement or action of a simple majority of the CVI Representatives
then in office (or the sole CVI Representative, if only one CVI Representative
shall then be in office) shall be valid and binding on each of the Indemnifying
CVI Securityholders and shall constitute the decision, agreement or action under
this Agreement of the CVI Representatives, and Raytel and the Escrow Agent shall
be entitled to rely on notices and instructions given by a majority of the CVI
Representatives or by the sole CVI Representative, as the case may be.

        Section 9. Termination. This Agreement shall terminate upon the later of
the Termination Date or the distribution by the Escrow Agent of all of the
Escrow Funds in accordance with this Agreement; provided that the provisions of
Sections 6 and 7 above shall survive such termination.

        Section 10. Notices. All notices, requests, demands, claims and other
communications hereunder shall be in writing. Any notice, request, demand,
claim, or other communication hereunder will be deemed given (i) upon receipt if
delivered personally (or if mailed by registered or certified mail), (ii) on the
day after dispatch if 


                                       10


<PAGE>   71


sent by overnight courier, or (iii) upon dispatch if transmitted by facsimile
(and confirmed by a copy delivered in accordance with clause (i) or (ii)),
addressed to the parties at the following addresses:


        If to Raytel:                           Copy to:
        ------------                            -------
        Raytel Medical Corporation              Gray Cary Ware & Freidenrich
        2755 Campus Drive, Suite 200            A Professional Corporation
        San Mateo, CA  94403-2515               400 Hamilton Avenue
        Facsimile:  (650) 349-8850              Palo Alto, CA  94301
        Attn:  Richard F. Bader                 Facsimile:  (650) 327-3699
        Chairman and Chief Executive Officer    Attn:  Dennis C. Sullivan, Esq.

        If to the CVI Representatives:          Copies to:
        David E. Wertheimer, M.D.               McGlinchey Stafford
        2443 S.W. Brookwood Lane                643 Magazine Street
        Palm City, FL 34990                     New Orleans, LA  70130
        Facsimile:                              Facsimile:  (504) 596-2800
                                                Attn:  James Fantaci, Esq.

        Robert Finzi
        DLJ Venture Capital Fund II, L.P.
        DLJ Capital Corporation
        Sprout Capital VI, L.P.
        3000 Sand Hill Road
        Bldg. 4, Ste. 220
        Menlo Park, CA 94025
        Facsimile:

        If to the Escrow Agent:
        First Trust of California, N.A.
        One California Street, Suite 400
        San Francisco, CA  94111
        Facsimile:  (415) 273-4593
        Attn:  Carol Andreacchi

        Any party may change its address for such communications by giving
notice thereof to the other parties in conformity with this Section 10. Copies
of any notice, request, demand, claim or other communication hereunder by
personal delivery or telecopy given to the Escrow Agent by either party, shall
be delivered to the other party as soon thereafter as practicable.


                                       11


<PAGE>   72


        Section 11. Successor Escrow Agent. In the event the Escrow Agent
becomes unavailable or unwilling to continue in its capacity herewith, the
Escrow Agent may resign and be discharged from its duties or obligations
hereunder by delivering a resignation to the parties to this Agreement, not less
than 60 days prior to the date when such resignation shall take effect. Raytel
may appoint a successor Escrow Agent without the consent of the CVI
Representatives so long as such successor is a bank with assets of at least $100
million, and may appoint any other successor Escrow Agent with the consent of
the CVI Representatives, which shall not be unreasonably withheld. If, within
such notice period, Raytel provides to the Escrow Agent written instructions
with respect to the appointment of a successor Escrow Agent and directions for
the transfer of any Escrow Funds then held by the Escrow Agent to such
successor, the Escrow Agent shall act in accordance with such instructions and
promptly transfer such Escrow Funds to such designated successor. If no
successor is so appointed, the Escrow Agent may apply to the court of competent
jurisdiction for such appointment.

        Section 12. General.

            (a) Governing Law, Assigns. This Agreement shall be governed by and
construed in accordance with the internal laws of the State of Delaware without
regard to conflict-of-law principles and shall be binding upon, and inure to the
benefit of, the parties hereto and their respective heirs, successors and
assigns.

            (b) Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

            (c) Entire Agreement. Except for the provisions of the Stock
Purchase Agreement referenced herein, this Agreement constitutes the entire
understanding and agreement of the parties with respect to the subject matter of
this Agreement and supersedes all prior agreements or understandings, written or
oral, between the parties with respect to the subject matter hereof.

            (d) Waivers. No waiver by any party hereto of any condition or of
any breach of any provision of this Escrow Agreement shall be effective unless
in writing. No waiver by any party of any such condition or breach, in any one
instance, shall be deemed to be a further or continuing waiver of any condition
or breach or a waiver of any other condition or breach of any other provision
contained herein.

            (e) Amendment. This Agreement may be amended only with the written
consent of Raytel, the Escrow Agent and the CVI Representatives.

                     [SIGNATURES ARE ON THE FOLLOWING PAGE.]


                                       12


<PAGE>   73

        IN WITNESS WHEREOF, the parties have duly executed this Escrow Agreement
as of the day and year first above written.

                                 RAYTEL MEDICAL CORPORATION

                                 Name:
                                      -----------------------------------------

                                 Title:
                                       ----------------------------------------

                                 FIRST TRUST OF CALIFORNIA, N.A.


                                 Name:
                                      -----------------------------------------

                                 Title:
                                       ----------------------------------------

                                 CVI REPRESENTATIVES

                                 ----------------------------------------------
                                 David Wertheimer, M.D.


                                 ----------------------------------------------
                                 Robert Finzi


                                       13


<PAGE>   74


                                  ATTACHMENT A

                        Indemnifying CVI Securityholders


<TABLE>
<CAPTION>
      Names and Addresses
      of Indemnifying CVI               Initial Portion of                Percentage of
        Securityholders                   Escrow Amount                    Escrow Funds
      -------------------               ------------------                -------------
<S>                                       <C>                                <C>  
Sprout Capital VI, L.P.                    $115,443.43                        23.09
3000 Sand Hill Road
Bldg 4., Ste 220
Menlo Park, CA 94025

DLJ Venture Capital Fund II,                 $2,017.18                          .40
L.P.
3000 Sand Hill Road
Bldg 4., Ste 220
Menlo Park, CA 94025

DLJ Capital Corporation                      $1,742.79                          .35
3000 Sand Hill Road
Bldg 4., Ste 220
Menlo Park, CA 94025

Menlo Ventures IV, L.P.                    $103,951.01                        20.79
3000 Sand Hill Road
Bldg 4., Ste 220
Menlo Park, CA 94025

Equus II Incorporated                       $68,257.13                        13.65
2929 Allen Parkway
Houston, TX 77219

Banc One Equity Investors Inc               $31,979.96                         6.39
(Successor-by-name-change) to
Premier Venture Capital
Corporation II
451 Florida Street
Baton Rouge, LA 70801
</TABLE>


                                       14


<PAGE>   75


<TABLE>
<S>                                         <C>                                <C> 
Louisiana Fund Corporation                  $30,092.98                         6.02
451 Florida Street
Baton Rouge, LA 70801

David Wertheimer, M.D.                     $100,505.66                        20.10
2443 S.W. Brookwood Lane
Palm City, FL 34990

Ralph Watts                                 $41,143.20                         8.23
336 Camp Street, Suite 250
New Orleans, LA 70130

Charles Miller                               $2,433.33                          .49
Paracelsus Healthcare Corp.
515 W. Greens Rd.
Suite 800
Houston, TX 77067

Jim VanDevender                              $2,433.33                          .49
Paracelsus Healthcare Corp.
515 W. Greens Rd.
Suite 800
Houston, TX 77067

                           Total           $500,000.00                       100.00%
</TABLE>



                                       15


<PAGE>   76

                                  ATTACHMENT B

                                Escrow Agent Fees


                                       16


<PAGE>   77


First Trust of California
One California Street
Suite 400
San Francisco, CA  94111

                         AUTOMATIC AUTHORIZATION LETTER

First Trust of California, National Association is hereby directed to invest and
reinvest account funds and other available monies in money market deposit
accounts at First Bank National Association.



Dated:  August   , 1997
               --

CVI REPRESENTATIVES                         RAYTEL MEDICAL CORPORATION


                                            By:
- --------------------------------------         --------------------------
        David Wertheimer, M.D.
                                            Name:
                                                 ------------------------

                                            Title:
- --------------------------------------            -----------------------
        Robert Finzi





                                            Administrator:
                                                          ----------------------

                                            Account Name:
                                                         -----------------------


                                            ------------------------------------


                                       17


<PAGE>   78


                                    EXHIBIT M


                           CONTINGENT PROMISSORY NOTE


$                                                              August   , 1997
 -------------------                                                  --

        FOR VALUE RECEIVED, Raytel Medical Corporation, a Delaware corporation
("Raytel"), hereby promises to pay to the order of 
                                                   ------------------------
("Payee") at Payee's address                           or at such other place as
                             -------------------------
Payee may designate in writing the principal amount of
                                                       -------------------------
Dollars ($            ), together with simple interest at the rate of Seven and
          ------------
one-half percent (7-1/2%) per annum assessed on the unpaid principal balance of
this Note as outstanding from time to time, commencing on the date hereof and
continuing until this Note is paid in full as provided herein.

        1. Definitions. As used in this Note, the following terms shall have the
meanings set forth below:

               (a) "Affiliate" shall mean, with respect to any person or entity,
(i) any other person or entity that directly or indirectly through one or more
intermediaries Controls, or is Controlled by, or is under common Control with,
such first person or entity.

               (b) "Cash Flow" shall mean, for any period, the Partnership's net
cash flow from operating, investing, and financing activities, as determined in
accordance with GAAP less the proceeds received during such period from any loan
or advance incurred to finance operating activities (as determined in accordance
with GAAP) plus the Partnership Debt Service for such period. The term "Cash
Flow" shall include without duplication (i) all management fees and other
payments made to CVI or any of its subsidiaries to the extent that such fees and
payments are provided for under contracts existing as of the date of this Note
and (ii) the reimbursement of CVI or any of its subsidiaries for expenses
incurred for the benefit of the Center, to the extent that such reimbursements
are provided for under contracts existing as of the date of this Note or made on
terms consistent with past practices.

            (c) "Center" shall mean the facility operated by the Partnership for
the provision of cardiac catheterization laboratory services and related nuclear
medicine procedures.

            (d) "Control" or "Controlled" shall mean the possession, directly or
indirectly, of the power to direct or cause the direction of the management and
policies of a person or entity, whether through the ownership of voting
securities, by contract or otherwise.

            (e) "Controlling Interest" shall mean, with respect to the
Partnership, an aggregate ownership of thirty percent (30%) or more of the
partnership interest (either in general partnership interest, limited
partnership interest or a combination thereof).

            (f) "CVI" shall mean Cardiovascular Ventures, Inc., a Delaware
corporation.


                                       1


<PAGE>   79


               (g) "CVI Notes" shall mean (i) the Promissory Note dated June 30,
1996, in the original principal amount of $558,651.00, issued by the Partnership
and payable to the order of CVI (the "1996 Note"), (ii) the Promissory Note,
dated January 14, 1997, in the original principal amount of $138,950.00, issued
by the Partnership and payable to the order of CVI (the "Demand Note") and (iii)
the Promissory Note, dated December ___, 1996, in the original principal amount
of $180,834.42, issued by Heart Associates, P.A. and payable to the order of
CVI.

            (h) "Divestiture Date" shall mean the date of any Divestiture
Transaction or, if a series of transactions, the last day of such series of
transactions.

            (i) "Divestiture Transaction" shall mean any transaction or series
of transactions causing Raytel or any of its Affiliates to no longer own
(directly or indirectly) a Controlling Interest in the Partnership.

            (j) "GAAP" shall mean generally accepted accounting principles,
consistently applied.

            (k) "Partnership" shall mean Heart Center of Towson, L.P., a
Maryland limited partnership.

            (l) "Partnership Debt Service" shall mean, for any period, (i) the
aggregate amount of all principal and interest payments, due and payable under
the CVI Notes, but unpaid as of the date of this Note and (ii) the aggregate
principal payments of the CVI Notes and the interest thereon, that becomes due
and payable during such period. For purposes of calculating the Partnership Debt
Service, the Demand Note shall be amortized over the remaining term of the 1996
Note.

            (m) "Stock Purchase Agreement" shall mean the Stock Purchase
Agreement dated as of August 11, 1997 by and among Raytel, CVI and the
Stockholders of CVI, pursuant to which Raytel acquired all of the issued and
outstanding capital stock of CVI.

        2. Nature of Obligation. This Note is one of a series of Notes
(collectively the "Raytel Notes"), in the aggregate principal amount of
$820,000, delivered by Raytel pursuant to the Stock Purchase Agreement to
certain former security holders of CVI, as partial consideration for the
purchase of shares of capital stock of CVI or the cancellation of options or
warrants to purchase such capital stock.

        3. Payment. Raytel shall pay the principal amount of this Note, and
accrued interest thereon as follows:

            (a) Provided that, on August 31, 1998, (i) Raytel or any Affiliate
of Raytel owns (directly or indirectly) a Controlling Interest in the
Partnership and (ii) the Center continues to operate through such date, then:

                       (i) if Cash Flow for the twelve (12) month period ending
August 31, 1998 (such twelve month period being the "Operation Period") equals
or exceeds the Partnership Debt Service for the Operation Period, the entire
outstanding principal amount of this Note, and all accrued interest thereon,
shall be due and payable forty-five (45) days following the end of such
Operation Period, and


                                       -2-
<PAGE>   80


                       (ii) if Cash Flow for the Operation Period is less than
the Partnership Debt Service for the Operation Period, then the principal amount
of this Note shall be reduced by multiplying such amount by a fraction, the
numerator of which is Cash Flow for the Operation Period and the denominator of
which is the Partnership Debt Service for the Operation Period, and, as so
adjusted, such principal amount together with accrued interest on such adjusted
principal amount shall be due and payable forty-five (45) days following the end
of the Operation Period.

            (b) If a Divestiture Transaction occurs at any time after September
30, 1997 but prior to August 31, 1998, then

                       (i) if Cash Flow for the period beginning on September 1,
1997 and ending on the last day of the calendar month preceding the Divestiture
Date (such period the "Divestiture Period") equals or exceeds the Partnership
Debt Service for the Divestiture Period, the entire outstanding principal amount
of this Note, and all accrued interest, shall be due and payable forty-five (45)
days following the end of the Divestiture Period, and

                       (ii) if Cash Flow for the Divestiture Period is less than
the Partnership Debt Service for the Divestiture Period, then Raytel shall pay,
within forty-five (45) days following the Divestiture Period, in full
satisfaction of the principal amount of this Note and accrued interest thereon,
an amount equal to: (A) seventy percent (70%) of (1) the net proceeds received
by Raytel and/or its Affiliates in such Divestiture Transaction and (2) the
principal amount of any obligations of the Partnership paid or assumed by the
purchaser(s) in such Divestiture Transaction, less (B) the amount of any
obligations of the Partnership paid or assumed by Raytel or any of its
Affiliates, provided that such amount shall in no case exceed the principal
amount of this Note plus all accrued interest thereon through the date which is
forty-five (45) days following such Divestiture Transaction.

            (c) In the event Raytel or any of its Affiliates causes the
Partnership to discontinue the operations of the Center (such an action referred
to as a "Closing Event" and the date of such action referred to as the "Closing
Date") and such Closing Event occurs between September 30, 1997 and August 31,
1998, then:

                       (i) if Cash Flow for the period beginning on September 1,
1997 and ending on the last day of the calendar month preceding the Closing
Event (such period the "Closing Period") equals or exceeds the Partnership Debt
Service for the Closing Period, the entire outstanding principal amount of this
Note, and all accrued interest, shall be due and payable forty-five (45) days
following the end of the Closing Period, and

                       (ii) if Cash Flow for the Closing Period is less than the
Partnership Debt Service for the Closing Period, then Raytel shall pay, within
forty-five (45) days following the Closing Period, in full satisfaction of the
principal amount of this Note and accrued interest thereon, an amount equal to
seventy percent (70%) of such Cash Flow less the amount of any obligations of
the Partnership paid or assumed by Raytel or any of its Affiliates, provided
that such amount shall in no case exceed the principal amount of this Note plus
all accrued interest thereon through the date which is forty-five (45) days
following the Closing Date.


                                      -3-


<PAGE>   81


            (d) If a Closing Event or Divestiture Event occurs on or prior to
September 30, 1997, the entire outstanding principal amount of this Note, and
all accrued interest thereon, shall be due and payable forty-five (45) days
following such Closing Event or Divestiture Event.

            (e) Raytel shall have the right at any time, and from time to time,
to prepay, in whole or in part, the principal amount of this Note, without
payment of any premium or penalty. Any principal prepayment shall be accompanied
by a payment of all interest accrued on the amount prepaid through the date of
such prepayment.

            (e) Principal and interest and all other amounts due hereunder shall
be paid in lawful money of the United States of America.

        4. Governing Law. This Note shall be governed by and construed under
the laws of the State of Delaware applied to agreements among Delaware
residents, made and to be performed entirely within the State of Delaware.

        5. Severability; Headings. The invalidity or unenforceability of any
term or provision of this Note will not affect the validity or enforceability of
any other term or provision hereof. The headings of this Note are for
convenience of reference only and will not alter or otherwise affect the meaning
of this Note.

        6. Attorney's Fees; Dispute Resolution. If suit is brought for
collection of this Note, Raytel agrees to pay all reasonable expenses, including
attorneys' fees, incurred by Payee in connection therewith whether or not such
suit is prosecuted to judgment; provided, however, that any dispute that relates
to the computation of the amount of principal and/or interest payable or the
timing of any such payment shall be resolved in accordance with the dispute
resolution provisions of Article XIII of the Stock Purchase Agreement (including
provisions with respect to the payment of expenses) and any such dispute shall
be consolidated with comparable disputes between Raytel and the payees under the
other Raytel Notes and resolved in a single proceeding.

        7. Assignment. This Note is transferable and assignable by Payee. Any
reference to Payee herein will be deemed to refer to any subsequent transferee
of this Note at such time as such transferee holds this Note.

                                    RAYTEL MEDICAL CORPORATION

                                    By:
                                       --------------------------------

                                    Title:
                                       --------------------------------



                                      -4-




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