Abstract
Ventriculographic1-2 and echocardiographic3 studies have demonstrated that in some subjects, the syndrome of midsystolic click and late systolic murmur4 is based on late systolic prolapse of mitral valve leaflets. We present here external carotid pulse tracings obtained from patients with angiographically documented prolapse of posterior mitral valve leaflets. All subjects had normal coronary arteriograms; there was no evidence of an aortic subvalvular pressure gradient at rest, during isoproterenol infusion, and after catheter provoked ventricular extrasystoles.
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