For mortality and readmission rates, numbers at or below the national rate are better. For Heart Attack Care and Heart Failure Care measures, numbers at or above the national rate are better. The Society of Thoracic Surgeons (STS) awarded UPMC Presbyterian with the highest national ranging of three stars for combined aortic valve replacement and coronary artery bypass graft surgery in the most recent reporting period (ending December 2014). For more Heart Surgery information, please visit the STS reporting database.