Song JY, et al. - Researchers explored the link between the anatomy of the intranasal cavity and small airway resistance in subjects with nonallergic rhinitis (NAR). They examined nasal patency using acoustic rhinometry to measure the volume of the nasal cavity at 0-5 cm in children who were 7 years old and participated in the Seongnam Atopy Project 2016. They also measured lung function of the lower airway using an impulse oscillometry system (IOS) and spirometry. They found a negative correlation of nasal symptoms and total eosinophil counts with nasal patency. Increased small airway resistance was detected among children with allergic rhinitis and NAR who had poor nasal patency.