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Associated Press
This undated image provided by Boston Scientific on Wednesday, Feb. 27, 2013 shows an experimental heart device called the Watchman. The future is unclear for the promising heart device aimed at preventing strokes in people at high risk of them because of an irregular heartbeat. Early results from a key study suggested it is safer than previous testing found, but may not be better than a drug that is used now for preventing strokes, heart-related deaths and blood clots in people with atrial fibrillation over the long term. The new study was to be the top presentation Saturday, March 9, 2013 at an American College of Cardiology conference in San Francisco. But the group took the unprecedented step of pulling it from the program just before it was to go on because Boston Scientific released results early to investors. (AP Photo/Boston Scientific)

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