Document Detail

Relationships between eupnoeic pattern of breathing and ventilatory control in man II. Early response to transient hypercapnia.
MedLine Citation:
PMID:  66039     Owner:  NLM     Status:  MEDLINE    
The individual importance of peripheral chemosensitive afferents was studied using a transient hypercapnia (inhalation of a 5% or a 10% CO2 in air gas mixture respectively during 4 or 2 breaths) in human conscious subjects chosen for their different eupnoeic ventilatory patterns. Calculation of the speed of change in end-tidal CO2 pressure in tracheal gas (sPETCO2) and of the rate of change in tidal volume (sVI) gave assessment for quantifying the sensitivity of arterial chemoreceptors to hypercapnia (sCO2=SVI/SPETCO2). Our results showed that, independently of any outside influence of the eupnoeic ventilatory pattern on the components of the chemical stimulus, sVI and sCO2 were found to be much smaller in subjects whose pattern of breathing was slow (i.e. having a large tidal volume). The possible causes of the weak importance of peripheral chemosensitive afferents in such subjects were discussed.
Y Jammes; C Guillot; C Prefaut; C Grimaud
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Archives internationales de physiologie et de biochimie     Volume:  84     ISSN:  0003-9799     ISO Abbreviation:  Arch. Int. Physiol. Biochim.     Publication Date:  1976 Dec 
Date Detail:
Created Date:  1977-04-28     Completed Date:  1977-04-28     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0405355     Medline TA:  Arch Int Physiol Biochim     Country:  BELGIUM    
Other Details:
Languages:  eng     Pagination:  969-79     Citation Subset:  IM    
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MeSH Terms
Carbon Dioxide
Chemoreceptor Cells / physiology*
Hypercapnia / physiopathology*
Middle Aged
Partial Pressure
Reg. No./Substance:
124-38-9/Carbon Dioxide

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