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Am J Physiol Regul Integr Comp Physiol 265: R792-R797, 1993;
0363-6119/93 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 265, Issue 4 792-R797, Copyright © 1993 by American Physiological Society

ARTICLES

Effects of anesthesia on cardiac and renal sympathetic nerve activities and plasma catecholamines

K. Matsukawa, I. Ninomiya and N. Nishiura
Department of Cardiac Physiology, National Cardiovascular Center Research Institute, Osaka, Japan.

The effects of pentobarbital and chloralose on cardiac sympathetic nerve activity (CSNA), renal sympathetic nerve activity (RSNA), arterial pressure (AP), and heart rate (HR) were examined using conscious cats. Arterial blood was sampled intermittently to measure plasma epinephrine. Pentobarbital (25-30 mg/kg iv) decreased CSNA, RSNA, AP, and HR. The reduction of CSNA (71 +/- 7%) was larger and lasted longer than that of RSNA (33 +/- 12%). Chloralose (40-50 mg/kg iv) decreased CSNA 66 +/- 9% and HR, increased RSNA 127 +/- 122%, and did not affect AP. The baroreflex relationship between AP and CSNA was examined by increasing AP to 145 mmHg and decreasing AP to 55 mmHg. Both pentobarbital and chloralose shifted the AP-CSNA relationship curve downward and blunted the slope of the curve, indicating that both drugs attenuate tonic and baroreflex cardiac sympathetic outflow. Pentobarbital and chloralose reduced plasma epinephrine, suggesting a decrease in adrenal sympathetic nerve activity. It is concluded that pentobarbital or chloralose affects differentially sympathetic outflows to different organs such as the heart, kidney, and adrenal gland.


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