CT Findings in Adults with Obstructive Sleep Apnea. Measurement of Pharyngeal Spaces with an Image Analyzer.:-Measurement of Pharyngeal Spaces with an Image Analyzer-

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The obstructive sleep apnea syndrome (OSAS) is characterized by recurrent obstruction of the upper airway during sleep.In this study, we performed CT scans in 20 adult OSAS patients and 6 control subjects, and measured the airspaces in the nasopharynx, mesopharynx and hypopharynx, using an image analyzer.The airspaces were significantly smaller at all sites of the pharynx in OSAS patients than in the control subjects, but they did not show a positive correlation with the apnea index or the body mass index.In good responders whose apnea indexes improved more than 50% after uvulo-palatopharyngoplasty (UPPP), the nasopharyngeal and mesopharyngeal airspaces were significantly smaller, and the hypopharyngeal space tended to be larger than in poor responders.Our results suggest that CT scan is a helpful method for analyzing the area of the upper airway, especially in relation to the response to UPPP in adults with OSAS.