Faculty Collaboration Database

Acute saline loading in normal and bilaterally atrial-resected conscious dogs. Am J Physiol 1988 Jul;255(1 Pt 2):H144-52

Date

07/11/1988

Pubmed ID

3293468

DOI

10.1152/ajpheart.1988.255.1.H144

Scopus ID

2-s2.0-0023683927 (requires institutional sign-in at Scopus site)   19 Citations

Abstract

Acute isotonic saline volume loads (400 ml) were intravenously administered to conscious, renal-denervated dogs before and after bilateral removal of the atrial free walls and atrial appendages to determine the role of atrial-mediated hormonal factors in the renal excretory response. In one group of dogs (n = 11), the volume was given in 10 min; in another group (n = 5), the volume was given in 30 min while arginine vasopressin (AVP) was infused to maintain plasma AVP at a fixed, normal level (3 pg/ml). Sodium and water excretion, mean arterial pressure, and plasma hormone levels were determined before and for 5 h after volume loads. Atrial resection resulted in a 40-50% reduction of sodium and water excretion in both groups during the first 2 h after volume expansion. The blunted renal excretory responses could not be explained by differences in arterial pressure, renal sympathetic nerve activity, or by hormonal differences of plasma immunoreactive atrial natriuretic factor (iANP), plasma AVP, plasma renin activity, or plasma aldosterone. Plasma iANP was not significantly increased by the volume load in either the normal or atrial-resected state. Atrial-resected dogs exhibited normal plasma levels of iANP. The data indicate the presence of an unidentified diuretic and natriuretic substance, which is released with volume expansion from either the cardiac atria or via the central nervous system, and that the release of this factor is removed by atrial resection.

Author List

Cowley AW Jr, Anderas PR, Skelton MM

Author

Allen W. Cowley Jr PhD Professor in the Physiology department at Medical College of Wisconsin

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

Aldosterone
Animals
Atrial Function
Blood Pressure
Body Water
Dogs
Female
Kidney
Male
Natriuresis
Renin
Renin-Angiotensin System
Sodium
Vasopressins