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Pig hearts are not used routinely for human heart transplants - xenotransplantation just does not work for long term use. People just seem to assume that animal to human transplantation is far more common than in reality - it is incredibly rare. Very occasionally it may be used to bridge a gap until a suitable human organ becomes available, but it is not a long term solution. Animal organs do not maintain function in a human body.

Please see related link for more info.

Porcine and bovine heart valves can be used for heart valve replacement operations in humans, but this is very different to having an organ donated from an animal.

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Q: Why do some people think that we shouldn't use pig's hearts for human heart transplants?
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