An ‘ongoing uncertainty’: How reliable are national CV hospital rankings?

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Hospitals ranked highest for cardiology and heart surgery by the U.S. News and World Report (USNWR) boast lower 30-day mortality rates for acute MI, heart failure and coronary artery bypass grafting (CABG), according to research published in JAMA Cardiology—but those same hospitals also see similar or higher readmission rates compared with hospitals that aren't ranked at all.