Effects of halothane on left ventricular relaxation and early diastolic coronary blood flow in the dog

The effects of graded concentrations of halothane on left ventricular relaxation and phasic coronary blood flow (CBF) were studied in six open-chest, anesthetized dogs. Global and regional left ventricular function were measured. Besides the expected dose-dependent depression of contractility, regio...

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Bibliographic Details
Published in:Anesthesiology (Philadelphia) 1989-04, Vol.70 (4), p.660-666
Main Authors: DOYLE, R. L, FÖEX, P, RYDER, W. A, JONES, L. A
Format: Article
Language:English
Subjects:
Anesthetics. Neuromuscular blocking agents
Animals
Biological and medical sciences
Coronary Circulation - drug effects
Dogs
Halothane - pharmacology
Hemodynamics - drug effects
Medical sciences
Myocardial Contraction - drug effects
Neuropharmacology
Pharmacology. Drug treatments
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Summary:The effects of graded concentrations of halothane on left ventricular relaxation and phasic coronary blood flow (CBF) were studied in six open-chest, anesthetized dogs. Global and regional left ventricular function were measured. Besides the expected dose-dependent depression of contractility, regional shortening, and cardiac output, halothane caused significant increases in the time constant of relaxation (Trelax), and decreased and delayed the nadir of peak negative left ventricular dP/dt. Dose-dependent reductions of CBF were noted. Percentage CBF during isovolumic relaxation was significantly reduced and showed a strong inverse correlation with Trelax. Halothane appears to interfere with the inactivation process of the heart; this in turn may impede the early rise in CBF during isovolumic relaxation.
ISSN:0003-3022
1528-1175
DOI:10.1097/00000542-198904000-00020