Heart of the Matter… I think the transplant process has already begun and the incorporation of entire hearts is just an expansion of existing heart valve transplants. Modern medicine has already dictated that using pig valves are ethically correct if it can extend someone life thus why should people be allowed to use the heart of a chimpanzee to also extend someones life. So from an ethical view i think this procedure would be justified.
As controversial it may be, if this keeps developing i believe that we will be able to create human animal hybrids. If we can use the heart of a chimp whats to say we cant other organs of animals to our benefit. At the rate of scientific development i would not be surprised if in a couple of years we start implanting livers and lungs from other animals into humans.