Ourania Preventza1, Joseph S Coselli2. 1. Division of Cardiothoracic Surgery, Baylor College of Medicine, Houston, Tex; Division of Cardiovascular Surgery, Texas Heart Institute, Houston, Tex. Electronic address: opsmile01@aol.com. 2. Division of Cardiothoracic Surgery, Baylor College of Medicine, Houston, Tex; Division of Cardiovascular Surgery, Texas Heart Institute, Houston, Tex.