Association Between Congenitally Quadricuspid Aortic Valve and Mitral Valve Prolapse

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We describe transthoracic echocardiograms in three patients with combined quadricuspid aortic valve and prolapsing mitral valve. None had symptoms of cardiac dysfunction. Two patients had precordial murmurs. A third patient was referred for evaluation of infective endocarditis. The fact that a quadricuspid aortic valve is clearly a congenital anomaly supports the view that mitral valve prolapse is a congenital anomaly that may be more strongly associated with quadricuspid aortic valves than once thought.