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Acute volume expansion decreases adrenocortical sensitivity to ACTH and angiotensin II. Am J Physiol 1985 Nov;249(5 Pt 2):R611-6

Date

11/01/1985

Pubmed ID

2998212

DOI

10.1152/ajpregu.1985.249.5.R611

Scopus ID

2-s2.0-17744407700   9 Citations

Abstract

This study examined the plasma aldosterone and corticosteroid responses to a 60-min infusion of adrenocorticotropin (ACTH) or angiotensin (ANG) II started immediately after an acute isotonic saline volume expansion (0.5 ml . kg-1 . min-1 for 30 min). Five conscious dogs of either sex with exteriorized carotid loops were used in this repeated-design study. Volume expansion per se caused a 10% decrease in hematocrit, a 12.5% decrease in plasma protein, and a 2.7-mmHg increase in central venous pressure with no change in mean arterial pressure, heart rate, or plasma sodium. Volume expansion per se also resulted in significant reductions in vasopressin, plasma renin activity, ACTH, aldosterone, and corticosteroid levels. The aldosterone responses to ACTH and ANG II were significantly inhibited (46-71%) by acute volume expansion. The corticosteroid response to ACTH was 19-29% inhibited by volume expansion. We conclude that acute volume expansion significantly inhibits the adrenocortical sensitivity to its tropic hormones probably via alterations of synergistic factors.

Author List

Raff H, Shinsako J, Wade CE, Keil LC, Dallman MF

Author

Hershel Raff PhD Professor in the Medicine department at Medical College of Wisconsin




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

Adrenal Cortex
Adrenocorticotropic Hormone
Angiotensin II
Animals
Blood Volume
Dogs
Drug Resistance
Female
Male
Sodium Chloride
Time Factors
jenkins-FCD Prod-484 8aa07fc50b7f6d102f3dda2f4c7056ff84294d1d