Q-T interval and T-wave amplitude after induced ventricular premature beats

Abstract

Single or paired premature ventricular contractions occurred in the electrocardiograms of 93 patients during cardiac cath-eterization. The amplitude of the T wave and the duration of the Q-T interval were measured immediately before and after the premature contraction. There was no significant difference in the mean values for either T-wave amplitude or Q-T interval before and after ventricular premature beats. No correlation was found between the right ventricular end-diastolic pressure or right ventricular systolic pressure, on the one hand, and individual variations of the Q-T interval and T-wave amplitude, on the other.