Document Detail


Potent bronchoprotective effect of deep inspiration and its absence in asthma.
MedLine Citation:
PMID:  10926658     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In the absence of deep inspirations, healthy individuals develop bronchoconstriction with methacholine inhalation. One hypothesis is that deep inspiration results in bronchodilation. In this study, we tested an alternative hypothesis, that deep inspiration acts as a bronchoprotector. Single-dose methacholine bronchoprovocations were performed after 20 min of deep breath inhibition, in nine healthy subjects and in eight asthmatics, to establish the dose that reduces forced expiratory volume in 1 s by >15%. The provocation was repeated with two and five deep inspirations preceding methacholine. Additional studies were carried out to assess optimization and reproducibility of the protocol and to rule out the possibility that bronchoprotection may result from changes in airway geometry or from differential spasmogen deposition. In healthy subjects, five deep inspirations conferred 85% bronchoprotection. The bronchoprotective effect was reproducible and was not attributable to increased airway caliber or to differential deposition of methacholine. Deep inspirations did not protect the bronchi of asthmatics. We demonstrated that bronchoprotection is a potent physiologic function of lung inflation and established its absence, even in mild asthma. This observation deepens our understanding of airway dysfunction in asthma.
Authors:
T Kapsali; S Permutt; B Laube; N Scichilone; A Togias
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  89     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2000 Aug 
Date Detail:
Created Date:  2000-09-15     Completed Date:  2000-09-15     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  711-20     Citation Subset:  IM    
Affiliation:
Division of Clinical Immunology, Department of Medicine, Johns Hopkins University, School of Medicine, Baltimore, Maryland 21224, USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aerosols
Allergens / toxicity
Asthma / physiopathology*
Bronchi / physiology*,  physiopathology*
Bronchoconstrictor Agents / pharmacology
Female
Forced Expiratory Volume
Humans
Male
Methacholine Chloride / pharmacology
Middle Aged
Reference Values
Reproducibility of Results
Respiratory Function Tests
Respiratory Mechanics / physiology*
Vital Capacity / physiology
Grant Support
ID/Acronym/Agency:
R01-HL-61277/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Aerosols; 0/Allergens; 0/Bronchoconstrictor Agents; 62-51-1/Methacholine Chloride

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