Medical College of Wisconsin
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Regional autoregulatory responses during infusion of vasoconstrictor agents in conscious dogs. Am J Physiol 1990 Oct;259(4 Pt 2):H1270-7 PMID: 2221130

Abstract

We investigated pressure-dependent autoregulatory responses in mesenteric, iliac, and renal vascular beds of conscious dogs during intravenous infusion of angiotensin II, phenylephrine, or arginine vasopressin at rates which increased arterial pressure by 20-40 mmHg. The arteries supplying these beds were instrumented with an electromagnetic flow probe, a nonoccluding catheter, and an electromagnetic flow probe, a nonoccluding catheter, and an occluder cuff connected with a servo-amplifier, which enabled us to return perfusion pressure to control levels during infusion of the vasoconstrictor agents. We attempted to differentiate between the increase in vascular resistance due to the direct effect of the vasoconstrictor agent and the increase induced by an autoregulatory response induced by elevations of aortic perfusion pressure. We measured a strong degree of autoregulation in the renal vascular bed with a fractional compensation value close to 1. Moderate autoregulation occurred in the mesenteric vascular bed, where the compensation was 0.4-0.5 with angiotensin II and phenylephrine and between 0.74 and 0.94 with vasopressin. No autoregulatory capacity could be demonstrated in the hindlimb. The findings indicate that, under conditions of increased systemic blood pressure, both the renal and the mesenteric vascular beds contribute to the increase in total peripheral resistance by pressure-dependent vasoconstrictor responses.

Author List

Hellebrekers LJ, Liard JF, Laborde AL, Greene AS, Cowley AW Jr

Author

Andrew S. Greene PhD Interim Vice Chair, Chief, Professor in the Biomedical Engineering department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Angiotensin II
Animals
Arginine Vasopressin
Blood Pressure
Consciousness
Dogs
Female
Hindlimb
Homeostasis
Ilium
Infusions, Intravenous
Male
Phenylephrine
Rats
Renal Circulation
Splanchnic Circulation
Vascular Resistance
Vasoconstrictor Agents



View this publication's entry at the Pubmed website PMID: 2221130
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