World Heart (WHRT) SC 13D WORLD HEART / HeartWare International ownership change

Exhibit 1.5

JOINT FILING AGREEMENT

The undersigned hereby agree that the statement on Schedule 13D, dated April 5, 2012 (the “Schedule 13D”), with respect to the common stock, par value $.001 per share, of World Heart Corporation is, and any amendments thereto executed by each of us shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k)(1) under the Securities and Exchange Act of 1934, as amended, and that this Agreement shall be included as an exhibit to the Schedule 13D and each such amendment. Each of the undersigned agrees to be responsible for the timely filing of the Schedule 13D and any amendments thereto, and for the completeness and accuracy of the information concerning itself contained therein. This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.

DATED: April 5, 2012	HEARTWARE INTERNATIONAL, INC.
	By:	/s/ Lawrence J. Knopf
	Name: Lawrence J. Knopf
	Title: Senior Vice President and General Counsel

OCEAN ACQUISITION HOLDING INC.
By:	/s/ Lawrence J. Knopf
Name: Lawrence J. Knopf
Title: Vice President and Secretary