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  • A model of minimally invasive heart valve by Edwards Lifesciences is seen in Washington, Tuesday, Sept. 21, 2010. (AP Photo/Jacquelyn Martin)

    Study backs new heart valve without cracking chest

    Thousands of older Americans who need new heart valves but are too frail to survive the surgery might soon get a chance at an easier option _ a way to thread in an artificial aortic valve without cracking their chests.

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