Faculty Collaboration Database

Regional adrenal blood flow during hypoxia in anesthetized, ventilated dogs. Am J Physiol 1989 Jan;256(1 Pt 2):H94-100

Date

01/01/1989

Pubmed ID

2536247

DOI

10.1152/ajpheart.1989.256.1.H94

Scopus ID

2-s2.0-0024529461 (requires institutional sign-in at Scopus site)   16 Citations

Abstract

The effect of hypoxic hypoxia (HH) and carbon monoxide hypoxia (COH) on adrenal medullary (MQ) and cortical (CQ) blood flow (radiolabeled microsphere technique) was studied in pentobarbital sodium-anesthetized, mechanically ventilated dogs. Animals were exposed to 60 min of hypoxia (arterial O2 content 8 vol%) induced by adding either nitrogen (HH, n = 6) or carbon monoxide (COH, n = 6) to the inspired gas. Whole adrenal Q and CQ increased by 70 and 50%, respectively, with HH but were unchanged during COH. MQ, however, increased threefold during both HH and COH. HH and COH both increased arterial levels of epinephrine, corticosteroids, and adrenocorticotropic hormone (ACTH). To determine whether the increase in CQ during HH was because of HH-induced increases in mean arterial blood pressure (MAP, approximately 20 mmHg), an additional group of animals (n = 6) was exposed to HH but had MAP maintained at control levels using a pressurized-bottle system. MAP control did not alter the CQ response to HH. We conclude that MQ appears to be associated with medullary secretory activity during hypoxia and that HH and COH stimulate adrenal medullary secretion equally. In contrast, CQ increases only with HH, despite similar increases in ACTH and corticosteroid levels during HH and COH, suggesting that an alternative mechanism is responsible for increased cortical blood flow during HH.

Author List

Nishijima MK, Breslow MJ, Raff H, Traystman RJ

Author

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

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

Adrenal Cortex Hormones
Adrenal Glands
Adrenocorticotropic Hormone
Anesthesia
Animals
Blood Pressure
Dogs
Epinephrine
Hydrogen-Ion Concentration
Hypoxia
Male
Microspheres
Norepinephrine
Oxygen Consumption
Regional Blood Flow
Respiration, Artificial