Pulmonary valve insufficiency
Pulmonary valve insufficiency (or incompetence, or regurgitation) is a condition where the pulmonary valve is not strong enough to prevent backflow into the right ventricle. If it is secondary to pulmonary hypertension it is referred to as a "Graham Steell" murmur.The three primary pathological mechanisms causing Pulmonary Valve insufficiency are dilatation of the pulmonic valve ring, acquired alteration of pulmonic valve leaflet morphology, or congenital absence or malformation of the valve
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