SUMMARYEighty-seven patients with proven mitral leaflet prolapse were studied emphasizing cardiodynamics and left ventricular asynergy. Significant associated features were female preponderance (83%), skeletal anomalies (pectus excavatum, straight back, scoliosis, narrow antero-posterior diameter of the chest), and anomalous coronary arteries (cork-screw patterns, short left main coronary artery, anomalous origin of the coronary arteries). Prolapse of the tricuspid leaflets was found in 15 (54%) who had right ventriculography.

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