[Systolic time intervals of the left ventricle in neuromuscular diseases]

In 64 patients having neuromuscular disease and in 11 healthy persons, preejection period (PEP), ejection time index (LVETI) and PEP/LVET ratio of the left ventricle were studied by indirect method. PEP was significantly longer, ejection time index was significantly shorter and PEP/LVET ratio was significantly higher in patients with progressive muscular dystrophy than healthy persons. In 75% of patients having this disease LVETI was shortened and only in 30% of them Ecg abnormalities could be detected. These findings are postulated to be due to diffusely decreased contractility of the left ventricular heart muscle in progressive muscular dystrophy.