X0303 4 2008-07-31 0 0001024520 WORLD HEART CORP WHRT 0001044321 MARXE AUSTIN W & GREENHOUSE DAVID M C/O SPECIAL SITUATIONS FUNDS 527 MADISON AVENUE, SUITE 2600 NEW YORK NY 10022 0 0 1 0 Common Stock 2008-07-31 4 P 0 90000000 0.1 A 93191737 I By Limited Partnerships SSFQP, Cayman, PE, LS and Marxe acquired shares of CS pursuant to a Recapitalization Agreement as amended on July 31, 2008. 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). 45,765,145 shares of Common Stock and 6,117,036 Wts to purchase 87,412 CS are owned by QP, 16,587,810 shares of CS and 2,217,742 Wts to purchase 31,692 CS are owned by Cayman, 16,685,105 shares of CS and 2,419,355 Wts to purchase 34,573 CS are owned by PE and 4,000,000 shares of CS are owned by LS. Marxe individually owns 10,000,000 shares of CS. The interest of Marxe and Greenhouse in the shares of Common Stock & Warrants owned by QP, Cayman, PE and LS is limited to the extent of his pecuniary interest. Austin W. Marxe 2008-08-04 David M. Greenhouse 2008-08-04