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Impact of allergic rhinitis on asthma in children: effects on bronchodilation test.

Allergy 2010 Februrary
BACKGROUND: Relevant relationship exists between upper and lower airways. Bronchial obstruction is a paramount feature of asthma and its reversibility is considered a diagnostic step for asthma diagnosis.

OBJECTIVE: This study aimed at evaluating a large group of children with allergic rhinitis alone for investigating the degree of brochodilation and possible factors related to it.

METHODS: Two hundred patients with allergic rhinitis and 150 normal subjects were consecutively evaluated. Clinical examination, skin prick test, spirometry, and bronchodilation test were performed in all patients.

RESULTS: Rhinitics showed a significant FEV(1) increase after bronchodilation test (P < 0.0001) in comparison both to basal values and to controls' levels. More than 20% of rhinitics had reversibility (> or =12% basal levels). Patients with reversibility had lower FEV(1) levels, longer rhinitis duration, and perennial allergy.

CONCLUSION: This study highlights the close link between upper and lower airways and the relevance of performing bronchodilation test in patients with allergic rhinitis and these characteristics.

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