Aortic valve stenosis is a type of heart valve disease. The valve between the lower left heart chamber and the body's main artery, called the aorta, gets narrow. The valve does not open fully. This lowers or blocks blood flow from the heart to the aorta and to the rest of the body. Usually the aortic valve has three cusps. It is called a tricuspid aortic valve. But some people are born with an aortic valve that has two cusps. When this happens, it's called a bicuspid aortic valve.
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