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Background and Objectives Nasal surgery is known to improve the quality of life in patientswith obstructive sleep apnea; however, its effect on the airway structure is little known. This study attempted to identify the impact of nasal surgery on the pharyngeal airway structure. Subjects and Method We enrolled in the study patients who underwent nasal surgery fromJuly 2015 to March 2018 due to nasal obstruction with severe snoring or sleep apnea. Patientswith palate surgery or previous history of airway surgery were excluded. Demographic factors,symptoms regarding nasal obstruction, sleep study, preoperative cephalometry, and postoperative3-month cephalometry were taken into account and analyzed. We also performed asubgroup analysis according to the severity of sleep apnea. Results Sixty-three patients were enrolled in this study. Soft palate thickness showed no significantchange. Pre and postoperative soft palate thickness were 10.82±3.00 and 11.11±3.35(p=0.261), respectively. However, the pharyngeal airway space was enlarged via nasal surgeryfrom 12.05±3.35 to 13.04±3.35 (p=0.006), respectively. The subgroup analysis showed that thepharyngeal airway was mainly enlarged in the patients with lower Apnea-Hypopnea Index (AHI). Conclusion Although nasal surgery does not reduce soft palate thickness, it can enlarge thepharyngeal airway space. The effect of surgery would be more prominent in patients withAHI of lower than 15 event/hour (p=0.005) as nasal surgery alone does not affect the pharyngealairway of patients with AHI greater than 15.

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