X0202 4/A 2004-10-27 2004-10-29 0 0001024520 WORLD HEART CORP WHRT 0001044321 MARXE AUSTIN W & GREENHOUSE DAVID M 153 E 53RD ST 55TH FL NEW YORK NY 10022 0 0 1 0 Common Stock 2004-10-27 4 P 0 2300 1.1 A 4712108 I By Limited Partnerships Common Stock 2004-10-28 4 P 0 7300 1.0767 A 4719408 I By Limited Partnerships 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 Cayman Fund, L.P. (Cayman), Special Situations Private Equity Fund, LP (PE), respectively. 331,420 shares of common stock, 1,000,000 convertible bonds convertible into 800,000 shares of common stock, 800,000 Wts to purchase 800,000 common stock and 2,217,742 Wts to purchase 316,820 Common Stock are owned by Cayman, 525,546 shares of common stock, 1,000,000 convertible bonds convertible into 800,000 shares of common stock, 800,000 Wts to purchase 800,000 common stock and 2,419,355 Wts to purchase 345,622 shares of common stock are owned by PE. The interest of Marxe and Greenhouse in the shares of Common Stock owned by Cayman and PE is limited to the extent of his pecuniary interest. Austin W. Marxe 2004-11-03 David M. Greenhouse 2004-11-03