Cardiology patients treated in hospitals at the top of U.S. News & World Report rankings had better survival rates, but not necessarily less risk of readmission, researchers found.

Thirty-day risk-standardized mortality rates were consistently lower among the top 50 U.S. hospitals in cardiology and heart surgery than at other centers, when looking at acute MI (11.9% vs

13.2%), heart failure (9.5% vs 11.9%), and coronary artery bypass grafting (2.3% vs 3.3%, all P