Transcatheter Aortic Valve Replacement (TAVR) is an alternative treatment option to traditional open heart surgery for patients presenting with severe aortic stenosis (a disease of the heart valves in which the opening of the aortic valve is narrowed). Currently, the procedure is limited to patients that meet a defined set of criteria and are considered non-surgical candidates. The procedure consists of inserting an artificial aortic valve via a catheter-based delivery system.