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The fraction of exhaled nitric oxide in exhaled air (FeNO) is considered to be a reliable marker of airway inflammation in asthma.1 High FeNO levels after withdrawal of inhaled corticosteroids (ICS) are associated with increased risk of impending asthma exacerbation.2 We conducted a prospective study in 103 6–16-year-old children with asthma (62% male, mean (SD) forced expiratory volume in 1 s (FEV1) 101.0 (12.1) % predicted), who had …
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.
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