A study found 91% of heart attack patients who required emergency angioplasty are being treated within the recommended 90 minutes of arriving at the hospital, an increase from 44% in 2005, according to Yale University researchers who reported results in the journal Circulation. Study author Dr. Harlan Krumholz said the improvements occurred because of programs such as the American College of Cardiology's D2B Alliance and hospitals sharing their strategies and successes.

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