Significance of heat loss in energetics of left ventricle.
Left ventricular heat loss was examined by measuring the temperatures in the coronary sinus blood, in the aortic blood, and in the left atrial blood by thermistors. The temperature was highest in the coronary sinus blood, in the aortic blood next, and it was the least in the left atrial blood. However, since the aortic blood flow was naturally higher than the coronary sinus blood flow, the heat loss was larger in the left ventricular cavity than in the rest of the chambers. This heat loss was mostly proportional to the magnitude of the changes of both the arterial blood pressure and the aortic blood flow.
D000818:Animals; D001013:Aorta, Thoracic / Q000502:physiology; D016275:Atrial Function; D001833:Body Temperature Regulation; D003326:Coronary Circulation; D004285:Dogs; D006339:Heart Rate; D008722:Methods; D016276:Ventricular Function