There is an increasing trend in considering a possible involvement of small airways in asthma.[ 2 ] Although there is no direct parameter to assess small airway obstruction, it has been suggested that forced expiratory flow at the 25% and 75% of the pulmonary volume (FEF 25-75 ) might be a suitable parameter to assess small airway obstruction rather than FEV 1 .[ 3 ] Our study aimed at assessment of subclinical airway obstruction in the allergic rhinitis patients.
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