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Am J Physiol Endocrinol Metab 256: E345-E351, 1989;
0193-1849/89 $5.00
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AJP - Endocrinology and Metabolism, Vol 256, Issue 3 E345-E351, Copyright © 1989 by American Physiological Society

ARTICLES

Oxygen consumption after massive sympathetic nervous system discharge

S. A. Lang, M. B. Maron and S. A. Signs
Department of Physiology, Northeastern Ohio Universities, College of Medicine, Rootstown 44272.

We evaluated the possibility that massive, sympathetic nervous system (SNS) activation [as may precede the development of neurogenic pulmonary edema (NPE)] increases O2 demand. O2 consumption (VO2) and plasma concentrations of the calorigenic agents, epinephrine (EPI) and norepinephrine (NE) were measured in alpha-chloralose-anesthetized dogs under control conditions and for 3 h after the administration of either 1) intracisternal (ic) veratrine to activate the SNS, 2) intravenous (iv) veratrine, 3) ic saline, or 4) ic veratrine, after clamping the adrenal blood vessels. VO2 increased 31.7 +/- 3.6% (SE), and EPI and NE increased to, respectively, 30,853 +/- 8,347 and 8,176 +/- 2,104 pg/ml in the ic veratrine group. No increases in VO2 and EPI and attenuated increases in NE were observed in the ic veratrine animals with clamped adrenals. No significant increases in VO2 or catecholamine concentrations were observed after ic saline or iv veratrine administration. These data suggest that the elevated VO2 may have been mediated by adrenal catecholamines and that an increased metabolic rate may complicate the ability of patients with severe NPE to balance O2 supply with demand.


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