World Heart Corporation ("WorldHeart"; Nasdaq: WHRT), a developer of mechanical circulatory systems, announced that it has received unconditional approval from the U.S. Food and Drug Administration ("FDA") for the bridge-to-transplant ("BTT") study of the Levacor Ventricular Assist Device ("VAD"). Study enrollment will encompass 160 subjects, a reduction from the approximately 200 subjects of the original statistical plan. As previously announced, the BTT study will begin initially at ten clinical sites... 
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