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Am J Physiol Heart Circ Physiol 257: H898-H903, 1989;
0363-6135/89 $5.00
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AJP - Heart and Circulatory Physiology, Vol 257, Issue 3 898-H903, Copyright © 1989 by American Physiological Society

ARTICLES

Pentobarbital attenuates pulmonary vasoconstriction in isolated sheep lungs

R. C. Wetzel and L. D. Martin
Department of Anesthesiology, Johns Hopkins Hospital, Baltimore, Maryland 21205.

Pentobarbital sodium is a widely used anesthetic agent that has been demonstrated to attenuate systemic vascular responses to multiple pressors. To determine whether pentobarbital affected pulmonary vasoreactivity we determined the pulmonary vascular response to hypoxia and potassium in isolated in situ perfused sheep lungs. The flow resistive characteristics of the pulmonary vasculature were assessed by determining mean instantaneous pressure-flow relationships over a wide range of flows (20-120 ml.min-1.kg body wt-1) with PIO2 of 200 and 30 Torr, with and without pentobarbital. Pentobarbital attenuated hypoxic pulmonary vasoconstriction (P less than 0.001) in a concentration-dependent fashion (50% effective concentration = 0.42 mM). In addition, the pulmonary constrictor response to potassium was markedly blunted by pentobarbital (P less than 0.001). We conclude that pentobarbital inhibits hypoxic pulmonary vasoconstriction in a concentration-dependent fashion and that this inhibition of pulmonary vasoconstriction in isolated sheep lungs is not specific for hypoxia.


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