Document Detail


Effects of volatile anaesthetic agents on enhanced airway tone in sensitized guinea pigs.
MedLine Citation:
PMID:  14722179     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Although volatile anaesthetics afford protection against bronchospasm, their potential to reverse a sustained constriction of hyperreactive airways has not been characterized. Accordingly, we investigated the ability of halothane, isoflurane, sevoflurane and desflurane to reverse lung constriction induced by prolonged stimulation of the muscarinic receptors in guinea pigs sensitized to ovalbumin. METHODS: Pulmonary input impedance (ZL) was measured using forced oscillations in five groups of ovalbumin-sensitized, mechanically ventilated guinea pigs. ZL was measured under baseline conditions, during steady-state bronchoconstriction induced by an i.v. infusion of methacholine (MCh), and after administration of one of the volatile agents at 1 MAC after the induction of a steady-state bronchoconstriction. Airway resistance (Raw), and parenchymal tissue resistive and elastic coefficients were extracted from ZL by model fitting. RESULTS: All four volatile agents exhibited an initial relaxation of the MCh-induced airway constriction followed by gradual increases in Raw. The bronchodilatory effect of isoflurane was the most potent (-28.9 (SE 5.5)% at 2 min, P<0.05) and lasted longest (7 min); sevoflurane and halothane had shorter and more moderate effects (-21.1 (3.9)%, P<0.05, and -6.1 (1.7)%, P<0.05, respectively, at 1 min). Desflurane caused highly variable changes in Raw, with a tendency to enhance airway tone. CONCLUSIONS: Volatile agents can reverse sustained MCh-induced airway constriction only transiently in sensitized guinea pigs. Isoflurane proved most beneficial in temporally improving lung function in the presence of a severe constriction of allergic inflamed airways. Desflurane displayed potential to induce further airway constriction.
Authors:
N Schütz; F Peták; C Barazzone-Argiroffo; F Fontao; W Habre
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of anaesthesia     Volume:  92     ISSN:  0007-0912     ISO Abbreviation:  Br J Anaesth     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2004-01-14     Completed Date:  2004-02-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372541     Medline TA:  Br J Anaesth     Country:  England    
Other Details:
Languages:  eng     Pagination:  254-60     Citation Subset:  IM    
Affiliation:
Division of Anaesthesiological Investigations, University of Geneva, Switzerland.
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MeSH Terms
Descriptor/Qualifier:
Airway Resistance / drug effects
Anesthetics, Inhalation / pharmacology*
Animals
Bronchoconstriction / drug effects*
Bronchoconstrictor Agents / diagnostic use
Guinea Pigs
Halothane / pharmacology
Isoflurane / analogs & derivatives*,  pharmacology
Lung Compliance / drug effects
Male
Methacholine Chloride / diagnostic use
Methyl Ethers / pharmacology
Pulmonary Gas Exchange / drug effects
Chemical
Reg. No./Substance:
0/Anesthetics, Inhalation; 0/Bronchoconstrictor Agents; 0/Methyl Ethers; 151-67-7/Halothane; 26675-46-7/Isoflurane; 28523-86-6/sevoflurane; 57041-67-5/desflurane; 62-51-1/Methacholine Chloride

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


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