Lung function impairment and eosinophilia in patients with eosinophilic chronic rhinosinusitis.

The best cutoff value of F eno for diagnosing eosinophilic airway disease in different categories of patients has been discussed, 16 , 37 , 38 , 39 and the results indicate that there may be significant proportions of patients with ECRS who have eosinophilic inflammation in the lower respiratory tract and the nasal and paranasal sinuses.

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