Document Detail


The contribution of neurogenic reflexes to hypertonic saline-induced bronchoconstriction in asthma.
MedLine Citation:
PMID:  8335859     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Hypertonic saline induces bronchoconstriction in most patients with asthma; however, the mechanisms involved are not clearly understood. We have investigated the role of neurogenic mechanisms in hypertonic saline-induced bronchoconstriction. METHODS: The effect of pretreatment with the anticholinergic drugs atropine and ipratropium bromide and the local anesthetic drug lidocaine on hypertonic saline responsiveness was studied in 11 subjects with asthma. Ultrasonically nebulized hypertonic saline challenge was given in a dose-response manner to determine the provocative dose of hypertonic saline-laden air required to produce a fall in forced expiratory volume in 1 second (FEV1) of 20% or greater (PD20HS). A control PD20HS with no pretreatment was measured before randomization, and on the next three visits PD20HS was determined after pretreatment with each of the following: intramuscularly administered atropine, inhaled ipratropium bromide, and inhaled lidocaine. RESULTS: The baseline mean FEV1 values increased by 3.5% and 4% 30 minutes after administration of atropine and ipratropium bromide, respectively, and decreased by 5.8% at 10 minutes after inhalation of lidocaine. These changes in the baseline FEV1 were not significant and did not have any effect on the PD20HS response. Premedication with atropine, ipratropium bromide, and lidocaine resulted in increases of 2.5, 2.0, and 2.6 times in mean PD20HS, respectively. CONCLUSIONS: The protection afforded by the drugs was variable in the individual subjects and not related to age, sex, baseline FEV1, provocative concentration of histamine causing a 20% fall in FEV1 or use of the inhaled corticosteroids. The protection afforded by anticholinergic and local anesthetic drugs suggests the contribution of neurogenic reflexes in the pathogenesis of hypertonic saline-induced bronchoconstriction in asthma.
Authors:
H K Makker; S T Holgate
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  The Journal of allergy and clinical immunology     Volume:  92     ISSN:  0091-6749     ISO Abbreviation:  J. Allergy Clin. Immunol.     Publication Date:  1993 Jul 
Date Detail:
Created Date:  1993-08-25     Completed Date:  1993-08-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1275002     Medline TA:  J Allergy Clin Immunol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  82-8     Citation Subset:  AIM; IM    
Affiliation:
Immunopharmacology Group, University of Southampton, Southampton General Hospital, England.
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Asthma, Exercise-Induced / drug therapy,  epidemiology,  physiopathology*
Atropine / administration & dosage
Bronchial Provocation Tests / methods,  statistics & numerical data
Bronchoconstriction / drug effects*,  physiology
Dose-Response Relationship, Drug
Drug Interactions
Female
Forced Expiratory Volume / drug effects
Histamine / administration & dosage
Humans
Ipratropium / administration & dosage
Lidocaine / administration & dosage
Male
Reflex / drug effects*,  physiology
Regression Analysis
Saline Solution, Hypertonic / administration & dosage,  pharmacology*
Time Factors
Chemical
Reg. No./Substance:
0/Saline Solution, Hypertonic; 137-58-6/Lidocaine; 51-45-6/Histamine; 51-55-8/Atropine; 60205-81-4/Ipratropium

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


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