HEARTSTREAM INC/DE
SC 13G/A, 1999-02-16
ELECTROMEDICAL & ELECTROTHERAPEUTIC APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 2)*

                                Heartstream, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                           Common Stock Par Vaue $.001
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    421963109
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                               
- --------------------------------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)

      Check the appropriate box to designate the rule pursuant to which
this Schedule is filed:
                               |_| Rule 13d-1 (b)
                               |_| Rule 13d-1 (c)
                               |X| Rule 13d-1 (d)

- ----------
      * The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

      The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
<PAGE>

CUSIP No. 421963109                 13G                       Page 2 of 19 Pages
- --------------------------------------------------------------------------------
(1) Name of Reporting Persons
    I.R.S. Identification Nos. of above persons. (entities only)

    Oak Management Corporation
    06-0990851
- --------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|_|
- --------------------------------------------------------------------------------
(3) SEC use only.

- --------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    Delaware
- --------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        Not applicable

    (6) Shared voting power:
        0

    (7) Sole dispositive power:
        Not applicable

    (8) Shared dispositive power:
        0

- --------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

     None
- --------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).

     
- --------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     0%
- --------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     CO
- --------------------------------------------------------------------------------
<PAGE>

CUSIP No. 421963109                 13G                       Page 3 of 19 Pages
- --------------------------------------------------------------------------------
(1) Name of Reporting Persons
    I.R.S. Identification Nos. of above persons. (entities only)

    Oak Investment Partners VI, Limited Partnership
    06-1412578
- --------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|_|
- --------------------------------------------------------------------------------
(3) SEC use only.

- --------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    Delaware
- --------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        0 shares of common stock

    (6) Shared voting power:
        Not applicable

    (7) Sole dispositive power:
        0 shares of common stock

    (8) Shared dispositive power:
        Not applicable

- --------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

     None
- --------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).

     
- --------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     0%
- --------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     PN
- --------------------------------------------------------------------------------
<PAGE>

CUSIP No. 421963109                 13G                       Page 4 of 19 Pages
- --------------------------------------------------------------------------------
(1) Name of Reporting Persons
    I.R.S. Identification Nos. of above persons. (entities only)

    Oak Associates VI, LLC
    06-1412579
- --------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|_|
- --------------------------------------------------------------------------------
(3) SEC use only.

- --------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    Delaware
- --------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        Not applicable

    (6) Shared voting power:
        0

    (7) Sole dispositive power:
        Not applicable

    (8) Shared dispositive power:
        0

- --------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

     None
- --------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).

     
- --------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     0%
- --------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     OO-LLC
- --------------------------------------------------------------------------------
<PAGE>

CUSIP No. 421963109                 13G                       Page 5 of 19 Pages
- --------------------------------------------------------------------------------
(1) Name of Reporting Persons
    I.R.S. Identification Nos. of above persons. (entities only)

    Oak VI Affiliates Fund, Limited Partnership
    06-1414970
- --------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|_|
- --------------------------------------------------------------------------------
(3) SEC use only.

- --------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    Delaware
- --------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        0

    (6) Shared voting power:
        Not applicable

    (7) Sole dispositive power:
        0

    (8) Shared dispositive power:
        Not applicable

- --------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

     None
- --------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).

     
- --------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     0%
- --------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     PN
- --------------------------------------------------------------------------------
<PAGE>

CUSIP No. 421963109                 13G                       Page 6 of 19 Pages
- --------------------------------------------------------------------------------
(1) Name of Reporting Persons
    I.R.S. Identification Nos. of above persons. (entities only)

    Oak VI Affiliates, LLC
    06-1414968
- --------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|_|
- --------------------------------------------------------------------------------
(3) SEC use only.

- --------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    Delaware
- --------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        Not applicable

    (6) Shared voting power:
        0

    (7) Sole dispositive power:
        Not applicable

    (8) Shared dispositive power:
        0

- --------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

     None
- --------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).

     
- --------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     0%
- --------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     OO-LLC
- --------------------------------------------------------------------------------
<PAGE>

CUSIP No. 421963109                 13G                       Page 7 of 19 Pages
- --------------------------------------------------------------------------------
(1) Name of Reporting Persons
    I.R.S. Identification Nos. of above persons. (entities only)

    Bandel L. Carano
    
- --------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|_|
- --------------------------------------------------------------------------------
(3) SEC use only.

- --------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    United States
- --------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        Not applicable

    (6) Shared voting power:
        0

    (7) Sole dispositive power:
        Not applicable

    (8) Shared dispositive power:
        0

- --------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

     None
- --------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).

     
- --------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     0%
- --------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     IN
- --------------------------------------------------------------------------------
<PAGE>

CUSIP No. 421963109                 13G                       Page 8 of 19 Pages
- --------------------------------------------------------------------------------
(1) Name of Reporting Persons
    I.R.S. Identification Nos. of above persons. (entities only)

    Gerald R. Gallagher
    
- --------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|_|
- --------------------------------------------------------------------------------
(3) SEC use only.

- --------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    United States
- --------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        Not applicable

    (6) Shared voting power:
        0

    (7) Sole dispositive power:
        Not applicable

    (8) Shared dispositive power:
        0

- --------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

     None
- --------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).

     
- --------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     0%
- --------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     IN
- --------------------------------------------------------------------------------
<PAGE>

CUSIP No. 421963109                 13G                       Page 9 of 19 Pages
- --------------------------------------------------------------------------------
(1) Name of Reporting Persons
    I.R.S. Identification Nos. of above persons. (entities only)

    Edward F. Glassmeyer
    
- --------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|_|
- --------------------------------------------------------------------------------
(3) SEC use only.

- --------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    United States
- --------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        Not applicable

    (6) Shared voting power:
        0

    (7) Sole dispositive power:
        Not applicable

    (8) Shared dispositive power:
        0

- --------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

     None
- --------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).

     
- --------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     0%
- --------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     IN
- --------------------------------------------------------------------------------
<PAGE>

CUSIP No. 421963109                 13G                      Page 10 of 19 Pages
- --------------------------------------------------------------------------------
(1) Name of Reporting Persons
    I.R.S. Identification Nos. of above persons. (entities only)

    Fredric W. Harman
    
- --------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|_|
- --------------------------------------------------------------------------------
(3) SEC use only.

- --------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    United States
- --------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        Not applicable

    (6) Shared voting power:
        0

    (7) Sole dispositive power:
        Not applicable

    (8) Shared dispositive power:
        0

- --------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

     None
- --------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).

     
- --------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     0%
- --------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     IN
- --------------------------------------------------------------------------------
<PAGE>

CUSIP No. 421963109                 13G                      Page 11 of 19 Pages
- --------------------------------------------------------------------------------
(1) Name of Reporting Persons
    I.R.S. Identification Nos. of above persons. (entities only)

    Ann H. Lamont
    
- --------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|_|
- --------------------------------------------------------------------------------
(3) SEC use only.

- --------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    United States
- --------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        Not applicable

    (6) Shared voting power:
        0

    (7) Sole dispositive power:
        Not applicable

    (8) Shared dispositive power:
        0

- --------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

     None
- --------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).

     
- --------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     0%
- --------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     IN
- --------------------------------------------------------------------------------
<PAGE>

CUSIP No. 421963109                 13G                      Page 12 of 19 Pages
- --------------------------------------------------------------------------------
(1) Name of Reporting Persons
    I.R.S. Identification Nos. of above persons. (entities only)

    Eileen M. More
    
- --------------------------------------------------------------------------------
(2) Check the appropriate box if a member of a group (see instructions)   (a)|_|
                                                                          (b)|_|
- --------------------------------------------------------------------------------
(3) SEC use only.

- --------------------------------------------------------------------------------
(4) Citizenship or place of organization.

    United States
- --------------------------------------------------------------------------------
Number of shares beneficially owned by each reporting person with:

    (5) Sole voting power:
        Not applicable

    (6) Shared voting power:
        0

    (7) Sole dispositive power:
        Not applicable

    (8) Shared dispositive power:
        0

- --------------------------------------------------------------------------------
(9) Aggregate amount beneficially owned by each reporting person.

     None
- --------------------------------------------------------------------------------
(10) Check if the aggregate amount in Row (9) excludes certain shares       |_|
     (see instructions).

     
- --------------------------------------------------------------------------------
(11) Percent of class represented by amount in Row 9.

     0%
- --------------------------------------------------------------------------------
(12) Type of reporting person (see instructions).

     IN
- --------------------------------------------------------------------------------

<PAGE>
                                                             Page 13 of 19 Pages

                                  Schedule 13G
                                 Amendment No. 2
                          Common Stock, Par Value $.001
                               CUSIP No. 421963109

Item 1(a)         Name of Issuer:

   Heartstream, Inc.

Item 1(b)         Address of Issuer's Principal Executive Offices:

   2401 Fourth Avenue
   Suite 300
   Seattle, WA  98121

Item 2(a)         Name of Person filing:

   Oak Investment Partners VI, Limited Partnership
   Oak Associates VI, LLC
   Oak VI Affiliates Fund, Limited Partnership
   Oak VI Affiliates, LLC
   Oak Management Corporation
   Bandel L. Carano
   Gerald R. Gallagher
   Edward F. Glassmeyer
   Fredric W. Harman
   Ann H. Lamont
   Eileen M. More

Item 2(b)         Address of Principal Business Office or, if none, Residence:

   c/o Oak Management Corporation
   One Gorham Island
   Westport, CT 06880

Item 2(c)         Citizenship:

   Please refer to Item 4 on each cover sheet for each filing person

Item 2(d)         Title of Class of Securities:

   Common stock, $.001 par value

Item 2(e)         CUSIP Number: 421963109

Item 3            Not Applicable.
<PAGE>

Item 4            Ownership.

      On March 26, 1998 Hewlett Packard Company ("Hewlett") acquired Heartstream
at which time the Reporting Entities exchanged their shares of Heartstream for
shares of common stock of Hewlett, representing less than 5% of such class.
These shares were sold during the year.

      Please see Items 5, 6, 7, 8, 9 and 11 for each cover sheet for each filing
entity.

Item 5            Ownership of Five Percent or Less of a Class.

      If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following: |X|

Item 6            Ownership of More than Five Percent on Behalf of Another 
                  Person.

      Not applicable

Item 7            Identification and Classification of the Subsidiary Which
                  Acquired the Security Being Reported on By the Parent Holding
                  Company.

      Not applicable

Item 8            Identification and Classification of Members of the Group.

      Not applicable

Item 9            Notice of Dissolution of Group.

      Not applicable

Item 10           Certification.

      Not applicable

<PAGE>

Signature

      After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Dated February 16, 1999

                                    Oak Investment Partners VI,
                                    Limited Partnership

                                    By: Oak Associates VI, LLC,
                                        As General Partner

                                    By: /s/ Edward F. Glassmeyer
                                        ----------------------------------------
                                        Managing Member


                                    Oak Associates VI, LLC

                                    By: /s/ Edward F. Glassmeyer
                                        ----------------------------------------
                                        Managing Member


                                    Oak VI Affiliates Fund, Limited Partnership

                                    By: Oak VI Affiliates, LLC
                                        As General Partner

                                    By: /s/ Edward F. Glassmeyer
                                        ----------------------------------------
                                        Managing Member


                                    Oak VI Affiliates, LLC

                                    By: /s/ Edward F. Glassmeyer
                                        ----------------------------------------
                                        Managing Member

<PAGE>

                                    OAK MANAGEMENT CORPORATION

                                    By: /s/ Edward F. Glassmeyer
                                        ----------------------------------------
                                        Name: Edward F. Glassmeyer
                                        Title: President

                                    /s/ Bandel L. Carano
                                    --------------------------------------------
                                    Bandel L. Carano

                                    /s/ Fredric W. Harman
                                    --------------------------------------------
                                    Fredric W. Harman

                                    /s/ Gerald R. Gallagher
                                    --------------------------------------------
                                    Gerald R. Gallagher

                                    /s/ Edward F. Glassmeyer
                                    --------------------------------------------
                                    Edward F. Glassmeyer

                                    /s/ Ann H. Lamont
                                    --------------------------------------------
                                    Ann H. Lamont

                                    /s/ Eileen M. More
                                    --------------------------------------------
                                    Eileen M. More

<PAGE>

                                INDEX TO EXHIBITS

                                                                     Page
                                                                     ----

EXHIBIT A               Agreement of Reporting Persons                18

<PAGE>

                                    Exhibit A

      Each of the undersigned hereby agrees that Amendment No. 2 to the Schedule
13G filed on the date hereof with respect to the shares of Common Stock of
Heartstream, Inc. has been filed on behalf of the undersigned.

Signature:

   Dated February 16, 1999

                                    Oak Investment Partners VI,
                                    Limited Partnership

                                    By: Oak Associates VI, LLC,
                                        As General Partner

                                    By: /s/ Edward F. Glassmeyer
                                        ----------------------------------------
                                        Managing Member


                                    Oak Associates VI, LLC

                                    By: /s/ Edward F. Glassmeyer
                                        ----------------------------------------
                                        Managing Member


                                    Oak VI Affiliates Fund, Limited Partnership

                                    By: Oak VI Affiliates, LLC
                                        As General Partner

                                    By: /s/ Edward F. Glassmeyer
                                        ----------------------------------------
                                        Managing Member


                                    Oak VI Affiliates, LLC

                                    By: /s/ Edward F. Glassmeyer
                                        ----------------------------------------
                                        Managing Member

<PAGE>

                                OAK MANAGEMENT CORPORATION

                                By: /s/ Edward F. Glassmeyer
                                    --------------------------------------------
                                    Name: Edward F. Glassmeyer
                                    Title: President

                                    /s/ Bandel L. Carano
                                    --------------------------------------------
                                    Bandel L. Carano

                                    /s/ Fredric W. Harman
                                    --------------------------------------------
                                    Fredric W. Harman

                                    /s/ Gerald R. Gallagher
                                    --------------------------------------------
                                    Gerald R. Gallagher

                                    /s/ Edward F. Glassmeyer
                                    --------------------------------------------
                                    Edward F. Glassmeyer

                                    /s/ Ann H. Lamont
                                    --------------------------------------------
                                    Ann H. Lamont

                                    /s/ Eileen M. More
                                    --------------------------------------------
                                    Eileen M. More



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