Abstract
A study of aorto-iliac blood flow was performed before and after sympathectomy in the dog anesthetized with sodium pentobarbital. Sodium pentobarbital was found to increase aortic blood flow as much as sympathectomy. Blood flow to one extremity was increased when the other was occluded and this increase remained even after flow was re-established. Sympathectomy performed on the occluded side resulted in no decrease in flow after release; however, if performed on the opposite side, the flow on the occluded side after release was markedly reduced. Two hours of aortic occlusion produced a 30 to 50 per cent reduction in aortic blood flow from the preocclusion level. Sympathectomy caused more than a twofold increase in aortic blood flow after aortic occlusion, but no appreciable increase was noted before occlusion. Sympathectomy protects against decreased blood flow after temporary vascular occlusion.
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