Document Detail

Effects of halothane on arrhythmias induced by myocardial ischaemia.
MedLine Citation:
PMID:  2720866     Owner:  NLM     Status:  MEDLINE    
The effect of halothane on arrhythmias induced by ischaemia was investigated in rats, isolated perfused rat hearts, and pigs. Responses to the occlusion of the left anterior descending coronary artery were determined in groups (n = 9) of chronically prepared rats treated with no halothane, 0.5, or 1.0 per cent halothane immediately after occlusion; in isolated rat hearts (n = 10) treated with no halothane, 0.5, 1.0, 2.0, or 4.0 per cent halothane for 15 min before and after occlusion; and 20-25 kg pigs (n = 11) anaesthetised with halothane or pentobarbital. The ECG, arrhythmias, blood pressure (BP), heart rate (HR) and extent of infarction were determined in each model. In pigs, left ventricular pressure, dp/dtmax and cardiac output were also measured. In chronically prepared rats, halothane anaesthesia started after occlusion was antiarrhythmic and decreased the incidence of ventricular fibrillation and resulting mortality. In isolated rat hearts, 0.5 or 1.0 per cent halothane had little effect on occlusion-induced arrhythmias. The highest concentration of halothane increased the incidence of ventricular fibrillation both before and after occlusion. Halothane decreased developed ventricular pressure in a dose-dependent manner. In acutely prepared pigs, halothane pre-treatment had no appreciable effect upon occlusion-induced arrhythmias when compared with pentobarbital anaesthesia. Thus, halothane is antiarrhythmic when treatment is initiated after occlusion in the rat but this action is not seen in isolated hearts or intact pigs. The antiarrhythmic action of halothane is, therefore, species and model dependent.
B A MacLeod; R McGroarty; R H Morton; M J Walker
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of anaesthesia = Journal canadien d'anesthésie     Volume:  36     ISSN:  0832-610X     ISO Abbreviation:  Can J Anaesth     Publication Date:  1989 May 
Date Detail:
Created Date:  1989-07-03     Completed Date:  1989-07-03     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8701709     Medline TA:  Can J Anaesth     Country:  CANADA    
Other Details:
Languages:  eng     Pagination:  289-94     Citation Subset:  IM    
Department of Anaesthesiology, Faculty of Medicine, University of British Columbia, Vancouver.
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MeSH Terms
Arrhythmias, Cardiac / physiopathology*,  prevention & control
Blood Pressure / drug effects
Cardiac Output
Catheterization, Swan-Ganz
Coronary Disease / complications*
Halothane / administration & dosage,  pharmacology*
Heart Rate / drug effects
Pentobarbital / pharmacology
Rats, Inbred Strains
Species Specificity
Ventricular Fibrillation / physiopathology
Reg. No./Substance:
151-67-7/Halothane; 76-74-4/Pentobarbital

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

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