Exhaled nitric oxide levels in patients with atopic cough and cough variant asthma

Background and objective: Atopic cough (AC) is an established clinical entity in Japan, in which patients present with a chronic persistent non‐productive cough. Exhaled nitric oxide (NO) is a biomarker of eosinophilic airway inflammation. The present study examined whether exhaled NO levels were increased in AC in comparison with cough variant asthma (CVA) and bronchial asthma (BA). Methods: Consecutive patients presenting with an isolated...