Repolarization of epicardial ventricular surface of rabbit heart in acute stenosis of the aortic arch

Overload of the cardiac left ventricle causes opposite local changes in repolarization duration (activation-recovery intervals) on the right-and left-ventricular epicardium, which depend on the duration of overload. The activation-recovery intervals on the right-ventricular lateral surface decrease after 1-min overload, but increase after 10-min overload. The length of activation-recovery intervals on the lateral surface of the left-ventricular apex increases after 10-min aortic stenosis more markedly in comparison with that after 1-min overload. Decrease/increase of local lengths of activation-recovery intervals results in modification of the general sequence of cardiac ventricular surface repolarization.