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CLINICAL TRIAL
JOURNAL ARTICLE
RANDOMIZED CONTROLLED TRIAL
Effect of montelukast added to inhaled corticosteroids on fractional exhaled nitric oxide in asthmatic children.
European Respiratory Journal 2002 September
The aim of this prospective, self-controlled, single-blind study was to assess the effect of montelukast added to maintenance therapy with inhaled corticosteroids (ICS) on fractional exhaled nitric oxide (FENO) in asthmatic children. Thirty-five children (age 11.2+/-0.4 yrs (mean+/-SEM)) with mild-to-moderate persistent asthma treated with low to medium doses of ICS and FENO > 20 parts per billion (ppb) were included. The patients were randomly assigned to two groups: 17 patients continued ICS (group C) and 18 had montelukast added to ICS for 3 weeks (group M). FENO measurements were performed in both groups at baseline (T1) and after 3 weeks (T2), and in group M also after 2 weeks of washout. FENO was measured by a chemiluminescence analyser using an on-line method (50 mL x s(-1)) with nitric oxide-free air. The overall mean daily dose of ICS was equivalent to 530+/-58 microg x day(-1) of beclomethasone in group M and to 564+/-55 microg x day(-1) of beclomethasone in group C. There were no significant differences in baseline FENO and forced expiratory volume in one second (FEV1) between the two groups. After 3 weeks there was a significant reduction of FENO values in patients of group M (T1 52.2+/-7.8 ppb, T2 36.1+/-4.6 ppb) but no significant changes in group C (T1 43.5+/-6.0 ppb, T2 47.8+/-9.4 ppb). In group M after 2 weeks of montelukast withdrawal, FENO rose to baseline values (55.6+/-8.7 ppb). In conclusion, after montelukast treatment there is a fractional exhaled nitric oxide reduction in asthmatic children receiving maintenance therapy with inhaled corticosteroids. This suggests an anti-inflammatory effect of montelukast additive to that of inhaled corticosteroids.
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