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Recent studies propose T H 2-mediated inflammation in patients with asthma-chronic obstructive pulmonary disease (COPD) overlap syndrome (ACOS). However, little is known about whether fractional exhaled nitric oxide (FeNO) differs between patients with ACOS and those with COPD alone. To address this knowledge gap, a nationally representative sample was analyzed to determine the difference in FeNO levels between patients with ACOS and those with COPD alone in the US population.

international journal of chronic obstructive pulmonary disease/international journal of copd

Fractional exhaled nitric oxide levels in asthma&amp;ndash;COPD overlap syndrome: analysis of the National Health and Nutrition Examination Survey, 2007&amp;ndash;2012