[Late ventricular potentials and left ventricular performance in patients with hypertrophic cardiomyopathy]

Twenty patients with hypertrophic cardiomyopathy were examined. They were found to have late ventricular potentials in the disease, which were characterized by an increase in average QRS complex duration, a decrease in voltage, and a rise in the duration of last 40 msec of the QRS complex filtered. Such patients generally exhibited lower exercise tolerance in severe asymmetric left ventricular hypertrophy, which caused a significant deterioration of cardiac pump function.