Exploiting the body's own ability to fight a heart attack

Scientists trying to find a way to better help patients protect themselves against harm from a heart attack are taking their cues from cardiac patients. The work on "ischemic preconditioning" mirrors a perplexing curiosity that physicians have long observed in their patients: When faced with a heart attack, people who have had a previous one oftentimes fare better than patients who have never had one.

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