Midsystolic carotid pulse wave retraction in subjects with prolapsed mitral valve leaflets.

V and echocardiography 3 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