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Am J Physiol Regul Integr Comp Physiol 255: R968-R973, 1988;
0363-6119/88 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 255, Issue 6 968-R973, Copyright © 1988 by American Physiological Society

ARTICLES

Effects of vasoactive intestinal peptide on vascular conductance are unaffected by anesthesia

T. G. Bouder, L. J. Huffman and G. A. Hedge
Department of Physiology, West Virginia University Medical Center, Morgantown 26506.

In rats anesthetized with ketamine and pentobarbital (KET/PB), vasoactive intestinal peptide (VIP) increases vascular conductance (VC) in the salivary gland, pancreas, and thyroid gland, whereas no changes in VC are observed in a number of other organs. Because anesthesia may alter the responsiveness of physiological systems, we compared the effects of VIP on organ VC in conscious or anesthetized rats. Chronically catheterized rats were studied in the conscious state or 30 min after induction of anesthesia with KET/PB, isoflurane, or Inactin. Blood flows were measured by the reference sample version of the radioactive microsphere (MS) technique using two MS injections (141Ce-MS/85Sr-MS). Mean arterial blood pressure was monitored and used in the calculation of VC. Organ VCs were similar under basal conditions in conscious and anesthetized rats. VIP infusion caused systemic hypotension and increased VCs in the salivary gland, pancreas, and thyroid gland, and these responses were largely unaffected by anesthesia. These results indicate that the anesthetics used do not alter basal VC or the responsiveness of the vasculature to exogenous VIP.


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