Mesenteric, renal, and iliac vascular resistance in dogs after hemorrhage

¹ Department of Physiology, University of Wisconsin, Madison, Wisconsin

Dogs were subjected to four consecutive bleedings of 5 ml/kg with an interval of 10 min between each. Blood flow in the renal, superior mesenteric, and common iliac arteries was measured with the electromagnetic flowmeter. Control blood flows averaged 448, 199, and 134 ml/min for superior mesenteric, renal, and iliac arteries, respectively. After 20 ml/kg blood was removed, superior mesenteric flow declined by 45%, renal by 52%, and common iliac by 40%. Calculated renal resistance increased little until after removal of 10 mg/kg blood, but there was a sharp increase after removal of 20 ml/kg. Mesenteric and iliac resistances increased from the onset of hemorrhage.