Document Detail

Interactive effects of volatile anesthetics, verapamil, and ryanodine on contractility and calcium homeostasis of isolated pregnant rat myometrium.
MedLine Citation:
PMID:  1530042     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Both volatile anesthetics and Ca2+ antagonists decrease uterine contractility. The interactive effects of anesthetics, verapamil, and ryanodine on myometrial muscular activity and on intracellular Ca2+ availability were examined. STUDY DESIGN: The effects of minimum alveolar concentrations of 0.5, 1.0, and 2.0 of halothane, enflurane, and isoflurane on electrically stimulated isometric mechanical activity of isolated longitudinal myometrium strips from 45 pregnant rats (15 to 21 days), superfused with Krebs' solution with or without 5.0 mmol/L Ca2+, 10(-7) and 10(-6) mol/L verapamil, and 10(-6) mol/L ryanodine, were compared. Analysis was performed by analysis of variance and Duncan test. RESULTS: All three anesthetics and verapamil produced dose-dependent depression of contractility. Increasing the Ca2+ concentration from 2.5 to 5.0 mmol/L in the superfusate partly reversed the depression. An additive effect of verapamil and anesthetics, especially enflurane, on contractile force was observed. Ryanodine had no effect on contractility, but it could partly counteract the depressant effect of anesthetics. CONCLUSION: Clinically used concentrations of volatile anesthetics modify Ca2+ availability and depress uterine contractility. General anesthesia, especially by enflurane, in patients being treated with calcium antagonists may represent a higher risk.
A Laszlo; N Buljubasic; B Zsolnai; J P Kampine; Z J Bosnjak
Publication Detail:
Type:  In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  American journal of obstetrics and gynecology     Volume:  167     ISSN:  0002-9378     ISO Abbreviation:  Am. J. Obstet. Gynecol.     Publication Date:  1992 Sep 
Date Detail:
Created Date:  1992-10-22     Completed Date:  1992-10-22     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370476     Medline TA:  Am J Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  804-10     Citation Subset:  AIM; IM    
Department of Anesthesiology, Medical College of Wisconsin, Milwaukee 53226.
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MeSH Terms
Anesthetics / pharmacology*
Calcium / metabolism*
Dose-Response Relationship, Drug
Drug Interactions
Homeostasis / drug effects
Myometrium / drug effects*
Osmolar Concentration
Rats, Inbred Strains
Ryanodine / pharmacology*
Uterine Contraction / drug effects*
Verapamil / pharmacology*
Grant Support
Reg. No./Substance:
0/Anesthetics; 15662-33-6/Ryanodine; 52-53-9/Verapamil; 7440-70-2/Calcium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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