Cardiovascular Surgery Program at Allegheny General Hospital Earns Top Ratings from the Society of Thoracic Surgeons for Quality, Patient Outcomes Font : A-A+ AHN's Flagship Receives the Maximum Three-Star Rating for Transcatheter Aortic Valve Replacement, Coronary Bypass Grafting and Aortic Valve Replacement with Coronary Artery Bypass Grafting PITTSBURGH, April 16, 2021 /PRNewswire-PRWeb/ -- Allegheny General Hospital (AGH), the flagship academic medical center of Allegheny Health Network (AHN), has earned the maximum three-star rating from the Society of Thoracic Surgeons (STS) for the q...