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In 26 patients with mitral valve prolapse, ventricular function was evaluated by mean velocity of circumferential fiber shortening (MVCF) as measured along the basilar, middle and apical axes. Significantly increased rates of MVCF were found in patients with mitral prolapse along the basilar axis (1.75 +/- 0.23 circ/sec) and middle axis (2.09 +/- 0.34 cir/sec) (P less than 0.025 and P less than 0.05, respectively). Patients with mitral valve prolapse and regurgitation demonstrated a significant increase in MVCF along the basilar axes (1.72 +/- 0.15 cir/sec) (P less than 0.05). Asynergy apperars to have a negative effect on the MVCF along the middle axis. The MVCF was found not to be related to clinical findings, symptoms or electrocardiographic changes. The mechanism for the increase in MVCF in patients with mitral valve prolapse remains unsettled.

Mean velocity of circumferential fiber shortening in prolapsed mitral leaflet syndrome.