| Potentiation by mild hypothermia of ventricular conduction disturbances and reentrant arrhythmias induced by bupivacaine in dogs. | |
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MedLine Citation:
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PMID: 2719314 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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High concentrations of bupivacaine and profound hypothermia individually cause intraventricular conduction disturbances and reentrant arrhythmias. The effects of the combination of relatively low concentrations of bupivacaine and mild hypothermia are unknown and are the subject of this study. Three groups (n = 10-12) of dogs anesthetized with thiopental-chloralose were treated as follows: group 1, bupivacaine + hypothermia; group 2, bupivacaine alone; group 3, hypothermia alone. Bupivacaine was administered as a 4 mg/kg iv bolus followed by an iv infusion of 0.1 mg.kg-1.min-1. Hypothermia, i.e., a 4 degrees C reduction in core temperature, was produced by cooling the blood with an extracorporeal circuit. The peripheral ECG was recorded to determine the duration of QRS complexes and the QT interval. Conduction time and effective refractory period (ERP) of ventricular contractile tissue were measured with right ventricular endocavitary electrodes. Measurements were made with the heart paced at 180 beats/min and without pacing. In group 1 dogs, bupivacaine (plasma level, 2.8 +/- 0.3 microgram/ml) initially caused a prolongation of conduction time and QRS duration, which were further lengthened (approximately doubled) by a temperature decrease of 4 degrees C from baseline. The QT interval and ERP also were increased but to a lesser degree. In dogs in which the effects were most pronounced, rhythm disorders, such as wave burst arrhythmias (most common), premature systoles, ventricular tachycardia, and even ventricular fibrillation, occurred either spontaneously or during pacing. Bupivacaine alone (group 2) increased QRS duration and conduction time significantly, whereas hypothermia alone (Group 3) did not cause changes in any conduction variables. In neither group were dysrhythmias observed.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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M Freysz; Q Timour; R I Mazze; L Bertrix; S Cohen; K Samii; G Faucon |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Anesthesiology Volume: 70 ISSN: 0003-3022 ISO Abbreviation: Anesthesiology Publication Date: 1989 May |
Date Detail:
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Created Date: 1989-06-12 Completed Date: 1989-06-12 Revised Date: 2007-11-15 |
Medline Journal Info:
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Nlm Unique ID: 1300217 Medline TA: Anesthesiology Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 799-804 Citation Subset: AIM; IM |
Affiliation:
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Claude Bernard University, Lyon, France. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Arrhythmias, Cardiac / chemically induced* Bupivacaine / administration & dosage, toxicity* Dogs Electrocardiography Female Heart Conduction System / drug effects* Hypothermia, Induced / adverse effects* Male |
| Chemical | |
Reg. No./Substance:
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2180-92-9/Bupivacaine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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