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Am J Physiol Endocrinol Metab 248: E95-E100, 1985;
0193-1849/85 $5.00
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AJP - Endocrinology and Metabolism, Vol 248, Issue 1 95-100, Copyright © 1985 by American Physiological Society

ARTICLES

Pentobarbital effects on plasma catecholamines: temperature, heart rate, and blood pressure

D. Baum, J. B. Halter, G. J. Taborsky Jr and D. Porte Jr

The effects of intravenous pentobarbital were studied in dogs. Plasma pentobarbital concentrations were inversely related to epinephrine and norepinephrine concentrations. Plasma catecholamines appeared fully suppressed at pentobarbital levels greater than 25-30 micrograms/ml. Furthermore, pentobarbital levels were negatively related to rectal temperature, heart rate, and mean blood pressure. The methods of pentobarbital administration influenced plasma pentobarbital as well as epinephrine and norepinephrine levels, temperature, heart rate, and blood pressure. These observations suggest the possibility that pentobarbital inhibits the sympathetic nervous system, which in turn may affect temperature, heart rate, and blood pressure. Because pentobarbital anesthesia affects plasma catecholamine concentrations, the regimen used in animal models requires consideration when interpreting data potentially influenced by the sympathetic nervous system.


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