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A research team led by investigators from Massachusetts General Hospital (MGH) and collaborators has shown, for the first time, that it may be possible to nonsurgically treat or even prevent the damage to a major heart valve that often occurs after a heart attack.

Thousands of unfortunate patients are badly in need of a replacement organ. As of April 2014, more than 122,000 such people in the United States were on the waiting list maintained by the national Organ Procurement and Transplant Network. But fewer than 30,000 of those patients will actually receive...