From 1997 and 2007, the number of Americans admitted to hospital for treatment of coronary artery disease decreased by 31 percent, which means it's no longer the No. 1 disease treated in hospitals. Pneumonia was the most common disease treated in U.S. hospitals in 2007. An analysis of national data also showed that hospitalizations for heart attack decreased 15 percent (732,000 to 625,000) from 1997 to 2007, according to the latest News and Numbers from the federal Agency for Healthcare Research and Quality. That means that heart attacks have moved from No. 4 to No. 10.
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