title: Left ventricular dimensions and systolic function during spontaneous heart rate changes: an echocardiographic study.
abstract: We examined the relationships between spontaneous heart rate (or conversely cycle length) changes and left ventricular diastolic dimensions and indices of systolic function in twenty-three subjects. In most there was clearly an inverse relationship between rate and these indices and nearly always a positive correlation between performance and end-diastolic dimension. Previously described relationship between heart rate and mean velocity of circumferential fiber shortening are applicable only when the heart rate is constant.
mesh_terms: D000293:Adolescent; D000328:Adult; D002306:Cardiac Volume; D002648:Child; D002675:Child, Preschool; D004452:Echocardiography; D005260:Female; D006331:Heart Diseases / Q000503:physiopathology; D006339:Heart Rate; D006352:Heart Ventricles / Q000503:physiopathology*; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008875:Middle Aged; D008905:Minicomputers; D009200:Myocardial Contraction; D013599:Systole