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Factors affecting bronchial hyperreactivity in asthmatic children
Koray Harmanci1, Arzu Bakirtas, Ipek Turktas
1Department of Allergy, Ministry of Health, Ankara Diskapi Children's Diseases Training and Research Hospital, Ankara, Turkey. korayharmanci@hotmail.com
Summary
Bronchial hyperresponsiveness (BHR) in children with asthma is more severe in younger patients and those with early symptom onset. Family history of asthma, passive smoking, and indoor allergen sensitization also correlate with increased BHR severity.
Area of Science:
- Pediatric Allergy and Immunology
- Respiratory Medicine
- Asthma Research
Background:
- Bronchial hyperresponsiveness (BHR) is a hallmark of asthma, characterized by exaggerated airway narrowing.
- Understanding factors influencing BHR severity in pediatric asthma is crucial for effective management.
Purpose of the Study:
- To investigate the relationship between various clinical factors and the severity of BHR in children diagnosed with asthma.
- To identify predictors of BHR severity in a pediatric asthma cohort.
Main Methods:
- Retrospective analysis of 135 children diagnosed with asthma between January 2007 and January 2008.
- Data collected from the Gazi University Hospital Pediatric Allergy and Asthma Department asthma database.
- Evaluation of factors including age, age at onset, family history, passive smoking, atopy, and allergen sensitization.
Main Results:
- BHR severity was not significantly different between sexes.
- Younger age and earlier age at symptom onset were associated with more severe BHR.
- Asthma patients with a first-degree relative with asthma and those exposed to passive smoking exhibited more severe BHR.
- Moderate-to-severe BHR correlated with increased hospitalizations, but not chronic asthma severity.
- Indoor allergen sensitization in atopic children was linked to more severe BHR.
Conclusions:
- Age, age at symptom onset, parental asthma, passive smoking, and baseline lung function are significant factors related to BHR in pediatric asthma.
- Serum IgE levels and skin prick test positivity did not directly correlate with BHR severity.
- While no overall link was found between atopy and BHR severity, indoor allergen sensitization was a key factor in atopic children.
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