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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1024520	World Heart Corp	WHRT	Electromedical & Electrotherapeutic Apparatus (3845)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1044321	M David Greenhouse & W Austin Marxe	C/O Special Situations Funds 527 Madison Avenue, Suite 2600 New York NY 10022		Yes	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2010-03-24	24,000	$2.35	3,473,685	No	4	P	Indirect	By Limited Partnership
Common Stock	Acquisiton	2010-03-25	6,200	$2.38	3,479,885	No	4	P	Indirect	By Limited Partnership
Common Stock	Acquisiton	2010-03-25	10,000	$3.35	3,489,885	No	4	P	Indirect	By Limited Partnership
Common Stock	Acquisiton	2010-03-25	300,000	$2.30	3,789,885	No	4	P	Indirect	By Limited Partnership

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	By Limited Partnership
No	4	P	Indirect	By Limited Partnership
No	4	P	Indirect	By Limited Partnership
No	4	P	Indirect	By Limited Partnership

Footnotes

This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Fund III QP, L.P (QP), Special Situations Cayman Fund, L.P. (Cayman), Special Situations Private Equity Fund, LP (PE) and Special Situations Life Sciences Fund, L.P. (LS). 1,635,386 shares of Common Stock are owned by QP, 593,998 shares of CS are owned by Cayman, 593,997 shares of CS are owned by PE and 284,923 shares of CS are owned by LS. Marxe individually owns 489,533 shares of CS and Greenhouse individually owns 192,048 shares of CS. The interest of Marxe and Greenhouse in the shares of Common Stock owned by QP, Cayman, PE, LS, Marxe and Greenhouse are limited to the extent of his pecuniary interest.