Circulation, Vol 79, 93-100, Copyright © 1989 by American Heart Association
EA Anderson and AL Mark
Studies of peripheral blood vessels in humans have focused primarily on
regulation of blood flow and vascular resistance, which are thought to
reflect small vessel caliber. Recent studies in animals have identified
flow-mediated and neurogenic changes in large artery diameter. This study
tested for flow-mediated dilatation and reflex constriction of the brachial
artery in humans. A dual-crystal pulsed Doppler system was used to measure
brachial artery diameter and blood flow proximal to the antecubital fossa.
To test for flow-mediated dilatation, flow through the brachial artery was
altered by an occluding cuff placed on the forearm distal to the site of
brachial artery flow and diameter measurement. Control blood flow was 123
+/- 20 ml/min, and brachial artery diameter was 4.74 +/- 0.17 mm (mean +/-
SEM). By inflating the distal occluding cuff (distal circulatory arrest),
flow was reduced through the brachial artery to 21 +/- 5 ml/min (p less
than 0.005), and brachial artery diameter was reduced to 4.35 +/- 0.20 mm
(p less than 0.001). By deflating the distal occluding cuff after 10
minutes (reactive hyperemia), brachial artery flow was increased to 358 +/-
55 ml/min (p less than 0.001), and diameter was increased to 5.6 +/- 0.19
mm (p less than 0.001). These interventions did not change systemic
arterial pressure and, as measured in three subjects, caused only small
changes in local brachial artery distending pressure. Thus, both increased
and decreased brachial artery blood flow produced significant changes in
brachial artery diameter without altering arterial distending pressure.
These data provide evidence for flow-mediated dilatation in
humans.(ABSTRACT TRUNCATED AT 250 WORDS)
ARTICLES
Flow-mediated and reflex changes in large peripheral artery tone in humans
Department of Medicine, University of Iowa College of Medicine, Iowa City 52242.
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