Local Regulation of Vascular Cross Section during Changes in Femoral Arterial Blood Flow in Dogs

¹ Institute for Experimental Medical Research, University of Oslo, Ullevaal Hospital, Oslo, Norway

Diameters of the exposed femoral artery of anesthetized dogs were continuously measured with ultrasonic elements of lead zirconate titanate. In 13 of 16 dogs vascular diameters increased following a sudden increment in arterial blood flow induced by the injection of vasodilating agents (acetylcholine, histamine) peripheral to the recording level, by opening an arteriovenous shunt, or after tetanic stimulation of the sciatic nerve. The dilatation response occurred despite slight reductions in femoral blood pressure, and was present after ganglionic blockade, blockade of alpha and beta receptors with phenoxybenzamine and propranolol, atropinization and injection of an antihistamine. The dilatation response was also observed after transsection of the femoral artery distal to the recording level and is therefore not dependent on the retrograde propagation of nervous or myogenous impulses along the vascular wall.

Submitted on March 23, 1970
Accepted on September 9, 1970

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