Too many people die needlessly at U.S. hospitals, according to a Medicare analysis showing wide variation in death rates between the best hospitals and the worst. The analysis examined death rates for heart attacks, heart failure, and pneumonia at more than 4,600 hospitals. At 5.9% of hospitals, patients with pneumonia died at rates significantly higher than the national average. With heart failure, 3.4% of hospitals had death rates higher than the average, and 1.2% of hospitals were higher when it came to heart attack.