Document Detail

Effects of sevoflurane on respiratory activities in the phrenic nerve of decerebrate cats.
MedLine Citation:
PMID:  7484033     Owner:  NLM     Status:  MEDLINE    
Although the depressive effect of sevoflurane on ventilation has been reported, its potency and mode of action on the neural respiratory activity is still unclear. Therefore, the effects of sevoflurane on the phrenic nerve discharge and the respiratory timing were compared with those of halothane. The efferent activity of the phrenic nerve was recorded from decerebrate, un-anesthetized and artificially ventilated cats, and its power spectrum was calculated. The inspiratory and expiratory periods were measured. Sevoflurane and halothane of the doses of 0.5-1.5 MAC were inhaled for 15 min. With 0.5 MAC, sevoflurane decreased the total power and two dominant spectral components of the high-frequency oscillation and medium-frequency oscillation in the power spectrum. With the same MAC dose, halothane had a greater depressive effect in a normocapnic condition with the vagus nerves being intact. In a state of hypercapnia or after vagotomy, the effect of halothane was considerably attenuated whereas that of sevoflurane remained unaltered. Halothane increased the neural respiratory rate much more than sevoflurane in both normocapnic and hypercapnic states. Vagotomy significantly weakened the effect of halothane to increase the respiratory rate but did not modify the effect of sevoflurane. With 1.0-1.5 MAC, both anesthetics severely decreased the phrenic power spectra and the potency difference became indistinct. The present findings demonstrate that sevoflurane has a weaker depressive effect on the respiratory nerve discharge and a smaller effect on the neural respiratory rate than halothane when the effects of 0.5 MAC were compared.(ABSTRACT TRUNCATED AT 250 WORDS)
A Masuda; A Haji; M Kiriyama; Y Ito; R Takeda
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta anaesthesiologica Scandinavica     Volume:  39     ISSN:  0001-5172     ISO Abbreviation:  Acta Anaesthesiol Scand     Publication Date:  1995 Aug 
Date Detail:
Created Date:  1995-12-04     Completed Date:  1995-12-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370270     Medline TA:  Acta Anaesthesiol Scand     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  774-81     Citation Subset:  IM    
Department of Anesthesiology, Faculty of Medicine, Toyama Medical University, Japan.
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MeSH Terms
Action Potentials / drug effects
Anesthetics / pharmacology*
Anesthetics, Inhalation / pharmacology
Decerebrate State / physiopathology*
Depression, Chemical
Ethers / pharmacology*
Halothane / pharmacology
Hypercapnia / physiopathology
Methyl Ethers*
Phrenic Nerve / drug effects,  physiopathology*
Respiration / drug effects*
Reg. No./Substance:
0/Anesthetics; 0/Anesthetics, Inhalation; 0/Ethers; 0/Methyl Ethers; 151-67-7/Halothane; 28523-86-6/sevoflurane

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