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Bronchial responsiveness to methacholine is increased in citrus red mite (Panonychus citri)-sensitive children without asthmatic symptoms.

Authors
Min, KU; Kim, YK; Park, HS; Lee, MH; Lee, BJ; Son, JW; Kim, YY; Cho, SH
Citation
Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology, 30(8):1129-1134, 2000
Journal Title
Clinical and experimental allergy : journal of the British Society for Allergy and Clinical Immunology
ISSN
0954-78941365-2222
Abstract
BACKGROUND: A recent investigation has suggested that citrus red mite (Panonychus citri, CRM) is a common sensitizing allergen among children living around citrus farms.



OBJECTIVE: A cross-sectional survey was performed to evaluate the bronchial responsiveness to methacholine in CRM-sensitive children without asthmatic symptoms.



SUBJECTS AND METHODS: A total of 375 children living around citrus farms were enrolled in this study. There were 201 boys and 174 girls with a mean age of 12.5 (range 7-16) years. Each subject was evaluated by a questionnaire, a skin prick test with 13 common inhalant allergens including CRM, and a methacholine bronchial provocation test (MBPT).



RESULTS: Positive rate of MBPT (PC20-methacholine < 25 mg/mL) was higher in atopic rhinitic and atopic control children than in nonatopic rhinitic and nonatopic control subjects (41.3% and 33.3% vs 17.2% and 15.4%, respectively, both P < 0.05). Slope of dose-response curve (DRS, %/mg/mL) was higher in atopic rhinitic children than in nonatopic rhinitic, atopic control and nonatopic control subjects (14.3 +/- 0.87 vs 9.4 +/- 0.72, 10.0 +/- 1.37 and 9.2 +/- 1.51, P < 0.05, respectively). Both the positive rate of MBPT and the DRS were increased in children with positive skin response to CRM than in those without sensitization (48.2% vs 22.9%, P = 0.0001; 15.6 +/- 1.26 vs 10.2 +/- 0.65, P = 0.0001).



CONCLUSION: Bronchial responsiveness is increased in citrus red mite-sensitive children even if they have no asthmatic symptoms.
MeSH terms
AdolescentAllergens/immunologyAnimalsAsthma/diagnosis/immunologyBronchial Hyperreactivity/*complications/diagnosisBronchial Provocation TestsChildCitrus/parasitologyDose-Response Relationship, ImmunologicFemaleHumansHypersensitivity, Immediate/complications/parasitologyMaleMethacholine Chloride/diagnostic useRhinitis/complications/parasitologyRisk FactorsSkin TestsTrombiculidae/*immunology
PMID
10931120
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Journal Papers > School of Medicine / Graduate School of Medicine > Allergy
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