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Anesth Analg 1990; 70:267-274
© 1990 International Anesthesia Research Society
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Effects of Thiobarbiturates on Smooth Muscle Reactivity in Isolated Aortas From Spontaneously Hypertensive Rats

Kumi Nakamura, MD, Yoshio Hatano, MD, Makoto Nishiwada, MD, Tsutomu Yakushiji, MD, Jin Woong Park, MD, and Kenjiro Mori, MD

Received from the Department of Anesthesia, Kyoto University Hospital, Sakyo-ku, Kyoto, Japan.

Abstract

The direct effects of thiobarbiturates on helical strips of aortas from spontaneously hypertensive (SH) rats were compared with those from Wistar-Kyoto (WKY) rats. At 5–6 wk of age, the arterial pressure of SH and WKY rats did not differ, and the effects of thiobarbiturates on aortic strips from SH and WKY rats were similar. By contrast, at the age of 10–12 or 20–21 wk arterial pressure was higher in SH than in WKY rats, and responses to thiobarbiturates differed in aortic strips from SH and WKY rats: contractile responses were greater in WKY than in SH rats, and relaxing effects were greater in SH than in WKY rats. Responses to sodium nitroprusside did not differ in the aortas of SH and WKY rats, but the effects of nifedipine were greater in strips from SH rats than from WKY rats at the age of 10–12 wk. Ca2+ -induced contractions of strips exposed to Ca2+ -free media and depolarized by high K+ were inhibited by treatment with thiamylal; the inhibition was greater in SH than in WKY rats. The increase in smooth-muscle relaxation induced by thiobarbiturates in strips from SH rats may be due to increased sensitivity to the Ca2+ -channel blocking action of thiobarbiturates.

Key Words: ANESTHETICS, INTRAVENOUS—thiamylal, thiopental • MUSCLE, SMOOTH—responses to barbiturates • ARTERIES—responses to barbiturates
Lippincott, Williams & Wilkins Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins and Stanford University Libraries' HighWire Press®. Copyright 1990 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999 HighWire Press
Copyright © 1990 by the International Anesthesia Research Society.