[Effect of slowing the heart rhythm on its electrical stability normally and following ligation of the coronary artery in the dog].
It was shown in experiments on anesthesized dogs that a decrease in the rate of cardiac contractions from moderate to low by vagal stimulation results in a sharp reduction of the duration of the vulnerable period and considerable increase in the threshold of ventricular fibrillation both under normal conditions and in acute coronary occlusion. A direct correlative connection between the rhythm of cardiac contractions and the duration of the vulnerable period was revealed. With maintained unaltered rhythm of cardiac contractions simultaneous maximum stimulation of both vagus nerves has no significant effect on the duration of the vulnerable period and threshold of ventricular fibrillation both under normal conditions and in acute coronary occlusion.
D000818:Animals; D001919:Bradycardia / Q000503:physiopathology; D003331:Coronary Vessels / Q000502:physiology*; D004285:Dogs; D004594:Electrophysiology; D006321:Heart / Q000502:physiology*; D006339:Heart Rate; D008026:Ligation; D014630:Vagus Nerve / Q000502:physiology; D014693:Ventricular Fibrillation / Q000503:physiopathology
Vliianie zamedleniia serdechnogo ritma na élektricheskuiu stabil'nost' serdtsa v norme i posle pereviazki koronarnoi arterii u sobak.