Cardiovascular effects associated with antidiuretic activity of vasopressin after blockade of its vasoconstrictor action in dehydrated dogs

Circulation Research
J F Liard

Abstract

In view of our previous findings that a specific antidiuretic (V2) agonist, 4-valine-8-D-arginine vasopressin, acutely increased cardiac output and heart rate in dogs, we examined the hypothesis that interaction with V2-like receptors might contribute to the hemodynamic response seen after blockade of the vasoconstrictor (V1) effect of arginine-vasopressin in dehydrated dogs. After 48 hours of water restriction which increased plasma vasopressin to 10.6 +/- 2.0 pg/ml, the V1 antagonist 1-(beta-mercapto-beta,beta-cyclopentamethylene propionic acid) 2-(O-methyl)tyrosine arginine-vasopressin, 10 micrograms/kg, was injected intravenously into six conscious dogs, and the combined V1 + V2 antagonist 1-(beta-mercapto-beta,beta,cyclopentamethylene propionic acid) 2-(O-ethyl)-D-tyrosine, 4-valine arginine-vasopressin, 10 micrograms/kg, was administered to another six dogs. Mean arterial pressure, cardiac output (electromagnetic flowmeter), and regional blood flows (radioactive microspheres) were measured before and 20-30 minutes after antagonist administration. Mean arterial pressure did not change significantly in either instance. Cardiac output increased by 31.0 +/- 7.1% after V1 blockade, but by only 10.8 +/- 2.1% following V1 + V2 b...Continue Reading

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