Can you describe a heart valve malfunction?

Heart Valve: The heart valves serve a function as a check valve. They direct blood flow in one direction and prevent back flow. Malfunction can be two ways: 1. The valve can be narrowed (stenosis) and restrict blood flow. 2. The valve may not close properly and leak (insufficiency).

Yes: The heart is a pump, it is made up of four chambers, there 4 valves in the heart. For the heart to pump effectively, the valves open to allow the blood to move from one compartment into another, then they close to prevent the blood from regurgitating back. They open and close synchronously. A valve malfunctions when it does not open well (becomes tight) or when it does not close well (leaks back).