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Allergen exposure modifies the relation of sensitization to fraction of exhaled nitric oxide levels in children at risk for allergy and asthma.
- Source :
-
The Journal of allergy and clinical immunology [J Allergy Clin Immunol] 2011 May; Vol. 127 (5), pp. 1165-72.e5. Date of Electronic Publication: 2011 Apr 03. - Publication Year :
- 2011
-
Abstract
- Background: Studies on airway inflammation, measured as fraction of exhaled nitric oxide (FENO), have focused on its relation to control of asthma, but the contribution of allergen exposure to the increase in FENO levels is unknown.<br />Objective: We evaluated (1) whether FENO levels were increased in children with allergic sensitization or asthma; (2) whether specific allergen exposure increased FENO levels in sensitized, but not unsensitized, children; and (3) whether sedentary behavior increased FENO levels independent of allergen exposures.<br />Methods: At age 12 years, in a birth cohort of children with a parental history of allergy or asthma, we measured bed dust allergen (dust mite, cat, and cockroach) by means of ELISA, specific allergic sensitization primarily based on specific IgE levels, and respiratory disease (current asthma, rhinitis, and wheeze) and hours of television viewing/video game playing by means of questionnaire. Children performed spirometric maneuvers before and after bronchodilator responses and had FENO levels measured by using electrochemical detection methods (NIOX MINO).<br />Results: FENO levels were increased in children with current asthma (32.2 ppb), wheeze (27.0 ppb), or rhinitis (23.2 ppb) compared with subjects without these respective symptoms/diagnoses (16.4-16.6 ppb, P < .005 for all comparisons). Allergic sensitization to indoor allergens (cat, dog, and dust mite) predicted higher FENO levels and explained one third of the variability in FENO levels. FENO levels were highest in children both sensitized and exposed to dust mite. Greater than 10 hours of weekday television viewing was associated with a 0.64-log increase in FENO levels after controlling for indoor allergen exposure, body mass index, and allergic sensitization.<br />Conclusion: Allergen exposures and sedentary behavior (television viewing/video game playing) might increase airway inflammation, which was measured as the FENO.<br /> (Copyright © 2011 American Academy of Allergy, Asthma & Immunology. Published by Mosby, Inc. All rights reserved.)
- Subjects :
- Adolescent
Animals
Asthma immunology
Asthma physiopathology
Breath Tests
Cats
Child
Dogs
Dust immunology
Female
Humans
Hypersensitivity, Immediate immunology
Hypersensitivity, Immediate physiopathology
Immunoglobulin E blood
Infant
Male
Mites immunology
Rhinitis immunology
Rhinitis physiopathology
Spirometry
Allergens adverse effects
Allergens immunology
Asthma diagnosis
Exhalation
Hypersensitivity, Immediate diagnosis
Nitric Oxide analysis
Rhinitis diagnosis
Subjects
Details
- Language :
- English
- ISSN :
- 1097-6825
- Volume :
- 127
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- The Journal of allergy and clinical immunology
- Publication Type :
- Academic Journal
- Accession number :
- 21463890
- Full Text :
- https://doi.org/10.1016/j.jaci.2011.01.066