What becomes of the broken-hearted? In cardiac medicine, the answer is usually brutally straightforward: they die. Heart disease is the leading cause of death worldwide and there is often precious little we can do about it. Pacemakers bring some relief and transplants work, but there are nowhere near enough donated hearts to go around. And unlike skin and liver cells, heart muscle cells can’t remake themselves. Once they get damaged or die, they are gone forever.
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