FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Guidant Investment CORP   2. Issuer Name and Ticker or Trading Symbol CARDIONET INC [BEAT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 4100 HAMLINE AVENUE N. 3. Date of Earliest Transaction (Month/Day/Year) 03/25/2008 (Street) ST PAUL, MN 55112-5798 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 03/25/2008   C   1,911,246 A (1) 1,911,246 D   Common Stock 03/25/2008   C   250,000 A (2) 2,161,246 D   Common Stock 03/25/2008   C   126,627 (5) A $ 3.5 2,287,873 D   Common Stock 03/25/2008   S   1,500,000 D $ 18 787,873 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Series C Convertible Preferred Stock

(1)

03/25/2008

C

3,822,493

(1)

(1)

Common Stock

1,911,246

$ 0

0

D

Series D Convertible Preferred Stock

(2)

03/25/2008

C

500,000

(2)

(2)

Common Stock

250,000

$ 0

0

D

Warrants to Purchase Series D-1 Convertible Preferred Stock

$ 3.5

03/25/2008

C

414,421

(3)

(4)

Common Stock

126,627 (5)

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Guidant Investment CORP 4100 HAMLINE AVENUE N. ST PAUL, MN 55112-5798		X

Signatures

/s/ Doreen Roberts, Corporate Secretary, by power of attorney		03/26/2008
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Each 2 shares of Series C Convertible Preferred Stock converted into 1 share of the Issuer's common stock upon the closing of the initial public offering for no additional consideration and had no expiration date.
(2)	Each 2 shares of Series D Convertible Preferred Stock converted into 1 share of the Issuer's common stock upon the closing of the initial public offering for no additional consideration and had no expiration date.
(3)	Warrants became exercisable on March 8, 2007.
(4)	Warrants to purchase Series D-1 Convertible Preferred were automatically net exercised immediately prior to the closing of the Issuer's initial public offering. Each 2 shares of Series D-1 Convertible Preferred Stock converted into 1 share of the Issuer's common stock upon the closing of the initial public offering for no additional consideration and had no expiration date.
(5)	Warrants were net exercised resulting in fewer shares being issued than if the exercise price had been paid for with cash.
Remarks: Exhibit 24.1      Power of Attorney

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