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The heart is a beating muscle that pumps blood throughout the body. Inside the heart, four valves direct blood flow in the appropriate path. However, a valve that has become narrowed or thickened can compromise blood flow. This condition is called valvular stenosis.
In a healthy heart, two valves control the flow of blood from the upper chambers, or atria, to the lower chambers, or ventricles. Two other valves control blood flow from the ventricles to ... more
