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Jornal de Pediatria
On-line version ISSN 1678-4782
JENTZSCH, Nulma S. et al. Nitric oxide in children with persistent asthma. J. Pediatr. (Rio J.) [online]. 2006, vol.82, n.3, pp. 193-196. ISSN 1678-4782. http://dx.doi.org/10.2223/JPED.1472.
OBJECTIVE: To assess the difference in exhaled nitric oxide levels in atopic and nonatopic asthmatic patients treated with anti-inflammatory drugs, and to compare exhaled nitric oxide measurement with lung function tests. METHODS: Cross-sectional study with 45 consecutively selected patients with moderate and severe persistent asthma, aged between 6 and 17 years, and treated with anti-inflammatory drugs for at least 1 year. The patients were split into two groups: atopic ones (with positive skin tests) and nonatopic ones. The clinical and functional assessments and the measurement of exhaled nitric oxide were carried out concomitantly. RESULTS: There was a male predominance (62.5%), with an age range between 6 and 13 years (mean of 10.4 years) in 85% of the patients. Neither the symptoms associated with asthma (p = 0.07), allergic rhinitis (p = 0.17), food allergy (p = 0.09), necessity of systemic corticosteroids (p = 0.10), antileukotrienes (p = 0.20) and antihistamines (p = 0.70), nor the three parameters used to assess lung function (FEV1, FEV1/FVC and FEF25-75%, p > 0.14) were statistically significant. The frequency of eczema (p < 0.005) and exhaled nitric oxide levels (p < 0.001) were higher among atopic patients. CONCLUSION: Results suggest that clinical and functional stability of asthma among atopic patients does not necessarily reflect an efficient control over the inflammatory process and a higher probability for recurrence after discontinuation of anti-inflammatory therapy.
Keywords : Asthma; atopy; exhaled nitric oxide.