Aortic valve stenosis

Aortic valve stenosis causes a thickening and narrowing of the valve between the heart's main pumping chamber (left ventricle) and the body's main artery (aorta). The narrowing creates a smaller opening for blood to pass through, reducing or blocking blood flow from the heart to the rest of the body. Typically the aortic valve has three cusps (tricuspid aortic valve), but some people are born with an aortic valve that has two cusps (bicuspid aortic valve).