TAVR is a minimally invasive procedure to replace a severely stenotic aortic valve. The aortic valve regulates blood flow from the left ventricle to the aorta. Aortic valve stenosis occurs when the valve thickens and narrows, reducing blood flow. TAVR can treat aortic stenosis in patients at high risk for open heart surgery or those whose artificial valves have failed. During TAVR, a catheter is used to guide a replacement valve through the body to the heart, where it is deployed to replace the diseased valve. TAVR allows for quicker recovery and shorter hospital stays than open heart surgery.