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The narrowing of the aortic valve in the heart which restricts blood flow through the valve and forces the heart to contract harder to pump blood into the aorta.
Bicuspid aortic valve disease
A congenital birth defect characterized by an aortic valve that only has two flaps instead of three; if the valve becomes narrowed, it is more difficult for the blood to flow through, and often the blood leaks backward.
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