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May 1974

Hemodynamic Response to Vasodilation and Exercise in "Critical" Arterial Stenosis: An Experimental Study in a Canine Model

Author Affiliations

From the Department of Surgery, State University of New York at Buffalo, and the Surgical Research Laboratories, Edward J. Meyer Memorial Hospital, Buffalo.

Arch Surg. 1974;108(5):712-714. doi:10.1001/archsurg.1974.01350290074012

A canine hind-limb exercise model is described that permits study of pressure and flow changes through an area of arterial stenosis before, during, and after exercise.

Following creation of a critical stenosis in the external iliac artery (50% reduction in flow), exercise alone resulted in an increase in flow over the stenosis related to the degree of exercise produced, accompanied by a widening of the arteriovenous oxygen difference and an increase in oxygen consumption.

Infusion of an intra-arterial vasodilator (tolazoline hydrochloride) during the exercise period resulted in only a negligible change in flow over the stenosis, but a marked narrowing of the arteriovenous difference (30%) with a resulting reduction in limb oxygen consumption.

These findings suggest that this intraarterial vasodilator opens arteriovenous shunts, apparently bypassing the capillary bed.

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