STUDIES ON COLLATERAL CIRCULATION. I. THERMIC CHANGES AFTER ARTERIAL LIGATION AND GANGLIONECTOMY

Abstract

In the dog ligation of one or both external iliac arteries close to the aorta was always followed by a decrease in temp. (10-30[degree] F.) in the corresponding foot. In most experiments a rise in temp. with a return to its previous level occurred about 13 hrs. after ligation. This indicates the presence of anatomical channels sufficient to care for the circulation after ligation and suggests that the reestablishment of former conditions by collateral circulation is a vasomotor phenomenon. This is further substantiated by the fact that the temperature of a limb which had dropped to room temperature after ligation of its external iliac artery rose to normal soon after removal of the tributary sympathetic ganglia and that simultaneous removal of the tributary sympathetic ganglia with ligation of the artery prevented the lowering of the temp. of that limb.