Document Detail

Cardiovascular effects of and interaction between calcium blocking drugs and anesthetics in chronically instrumented dogs. I. Verapamil and halothane.
MedLine Citation:
PMID:  3963476     Owner:  NLM     Status:  MEDLINE    
In order to assess the interaction between halothane and verapamil on the cardiovascular system, mongrel dogs were instrumented so that the following measurements could be made awake and under the influence of the drugs: aortic, left ventricular, and left atrial blood pressures; myocardial segment length shortening; heart rate and rhythm; and coronary, carotid, and renal blood flows. The effect of two infusion doses of verapamil (3 micrograms X kg-1 X min-1 and 6 micrograms X kg-1 X min-1 after 200 micrograms X kg-1 bolus) were examined awake. On a different day in the same dogs, two concentrations of halothane (1.2-low and 2.4-high % end-tidal) and the effect of the two infusion doses of verapamil during low and high halothane were studied. Thirty minutes of either infusion dose of verapamil produced only heart rate and electrocardiographic P-R interval increases in conscious dogs. Halothane produced dose-related decreases in mean aortic pressure, left ventricular maximum rate of tension development (dP/dt), and segment length shortening and increases in heart rate and left atrial pressure. Carotid blood flow was increased by low halothane concentrations and returned to control with high halothane concentrations. There were no significant changes in coronary or renal blood flow produced by halothane. Verapamil infusion during low halothane concentration produced minimal effects. However, both the 3 and 6 micrograms X kg-1 X min-1 verapamil doses further depressed hearts already depressed by the high concentrations of halothane and decreased renal and carotid blood flows.(ABSTRACT TRUNCATED AT 250 WORDS)
J E Chelly; K Rogers; E S Hysing; A Taylor; C Hartley; R G Merin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Anesthesiology     Volume:  64     ISSN:  0003-3022     ISO Abbreviation:  Anesthesiology     Publication Date:  1986 May 
Date Detail:
Created Date:  1986-05-22     Completed Date:  1986-05-22     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1300217     Medline TA:  Anesthesiology     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  560-7     Citation Subset:  AIM; IM    
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MeSH Terms
Anesthesia, Intratracheal*
Blood Pressure / drug effects
Cardiovascular System / drug effects*
Carotid Arteries / physiology
Coronary Circulation
Depression, Chemical
Dose-Response Relationship, Drug
Drug Interactions
Halothane / administration & dosage,  pharmacology*
Heart Rate / drug effects
Monitoring, Physiologic*
Myocardial Contraction / drug effects
Regional Blood Flow / drug effects
Renal Circulation / drug effects
Verapamil / administration & dosage,  metabolism,  pharmacology*
Reg. No./Substance:
151-67-7/Halothane; 52-53-9/Verapamil

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

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