Adrenal blood flow and secretory relationships during hypoxia in anesthetized dogs. Am J Physiol 1989 Nov;257(5 Pt 2):H1458-65
Date
11/01/1989Pubmed ID
2556046DOI
10.1152/ajpheart.1989.257.5.H1458Scopus ID
2-s2.0-0024358161 (requires institutional sign-in at Scopus site) 6 CitationsAbstract
To evaluate whether hypoxia-induced increases in adrenal cortical (CQ) and medullary (MQ) blood flow (radiolabeled microspheres) occur secondary to hypoxia-induced secretory activity, pentobarbital-anesthetized ventilated dogs were pretreated with dexamethasone (DEX) to prevent adrenocorticotropic hormone (ACTH) and corticosteroid secretory changes or underwent unilateral adrenal denervation to prevent adrenal catecholamine secretory responses. In nonsurgically stressed dogs, DEX completely prevented increases in ACTH or corticosteroid levels during reduction of arterial oxygen content to 8 vol% but had no effect on hypoxia-induced doubling of CQ. In dogs in which adrenal oxygen consumption (VO2) was measured, DEX reduced VO2 by 50% without altering CQ. Unilateral adrenal denervation prevented hypoxia-induced increases in adrenal catecholamine secretion and MQ but had no effect on the CQ response. These results suggest that hypoxia-induced medullary vasodilation is associated with adrenal catecholamine secretory activity but that increases in CQ occur independent of secretory activity and likely represent direct vascular effects of hypoxia.
Author List
Breslow MJ, Ball TD, Miller CF, Raff H, Traystman RJAuthor
Hershel Raff PhD Professor in the Academic Affairs department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
Adrenal GlandsAdrenocorticotropic Hormone
Anesthesia
Animals
Denervation
Dexamethasone
Dogs
Hypoxia
Laparotomy
Male
Oxygen Consumption
Regional Blood Flow