Failure of a heart valve to close completely,thereby leading to regurgitation or flow of blood in a reverse direction,is called:

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Valvular insufficiency is the condition in which a heart valve fails to close completely, allowing blood to flow in the wrong direction. Stenosis (A) refers to a narrowing of the valve opening, while congenital stenosis (B) refers to a valve that is abnormally narrow from birth. Infective endocarditis (D) is an infection of the heart lining and valves, which can lead to valve damage but is not a specific cause of valvular insufficiency.

Failure of a Heart Valve to Close Completely,thereby Leading to Regurgitation