Document Detail

Small airways response to naturalistic cat allergen exposure in subjects with asthma.
MedLine Citation:
PMID:  17088132     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: It is currently unclear whether the small airways (diameter <2 microm) contribute significantly to late asthmatic reactions to inhaled allergen. OBJECTIVES: We sought to determine whether naturalistic exposure to cat allergen induced late responses in the small airways as measured by pulmonary function testing and high-resolution computed tomography (HRCT) of the chest performed at end-expiration. METHODS: In a group of 10 subjects with cat-induced asthma, physiologic studies (spirometry and lung volumes, including closing volume) and HRCT were performed before and 6 and 23 hours after a cat room challenge that caused a 20% or greater acute fall in FEV(1). RESULTS: There was no significant decline in FEV(1) at 6 or 23 hours after cat exposure. Forced expiratory flow at 25% to 75% of forced vital capacity was significantly decreased at 6 hours after the challenge and returned to normal by 23 hours. HRCT image analysis as well as closing volume demonstrated increased air trapping from baseline at both 6 and 23 hours after the challenge. In addition, image analysis demonstrated a significant increase in small airways hyperresponsiveness to methacholine at 23 hours after the challenge. No significant mean changes were noted in lung volumes at either 6 or 23 hours or in PC(20) FEV(1) at 23 hours postchallenge. CONCLUSION: These findings demonstrate that naturalistic exposure to cat allergen results in significant small airways obstruction and hyperresponsiveness persisting for at least 23 hours, at which time these changes cannot be detected by conventional physiologic measures. CLINICAL IMPLICATIONS: Physiologically silent distal lung inflammation persists after an antigenic challenge.
Michelle R Zeidler; Jonathan G Goldin; Eric C Kleerup; Hyun J Kim; Dao A Truong; David W Gjertson; Nola J Kennedy; Kenneth B Newman; Donald P Tashkin; Jeffrey M Silverman; Jonathan Corren
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-09-08
Journal Detail:
Title:  The Journal of allergy and clinical immunology     Volume:  118     ISSN:  0091-6749     ISO Abbreviation:  J. Allergy Clin. Immunol.     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-11-07     Completed Date:  2006-12-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1275002     Medline TA:  J Allergy Clin Immunol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1075-81     Citation Subset:  AIM; IM    
Division of Pulmonary, David Geffen School of Medicine and Allergy Research Foundation, University of California, Los Angeles, CA 90025, USA.
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MeSH Terms
Allergens / administration & dosage*,  immunology*
Asthma / immunology*,  physiopathology*
Bronchial Provocation Tests
Glycoproteins / administration & dosage*,  immunology*
Tomography, X-Ray Computed
Total Lung Capacity
Reg. No./Substance:
0/Allergens; 0/Fel d 1 protein, Felis domesticus; 0/Glycoproteins

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