Aortic Valve | STS: "The most common cause of aortic valve disease requiring surgery is called "senile aortic calcification," meaning that the valve has worn out with age. When a valve becomes worn, the body deposits calcium on it for reasons that are unknown. The calcium restricts or limits the motion of the valve leaflets. This may prevent the valve from opening (causing stenosis) or closing (causing leakage or regurgitation). Less common causes of aortic valve disease include diseases of the aorta, the main blood vessel coming out of the heart and carrying blood to the rest of the body, including ascending aortic aneurysms, aortic dissection, and Marfan's syndrome."
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