ABSTRACT
BACKGROUND AND OBJECTIVES: Polysomnography (PSG) is useful for the diagnosis of obstructive sleep apnea (OSA) and the analysis of its occurrence and severity. Nevertheless, physical examination and PSG are not sufficient to localize the obstructed structure before operation. Drug-induced sleep endoscopy (DISE), on the other hand, is expected to provide an accurate diagnosis as it can be used to evaluate the intensity of operative effect and can minimize additional unnecessary procedures. The aim of this study is to analyze correlation between the results of polysomnography and obstructive structure by DISE in OSA Patients. SUBJECTS AND METHOD: This study was conducted on 75 patients, who were diagnosed with OSA by PSG and DISE. Obstruction levels and individual structures were classified by modified VOTE classification. The patients were divided into groups according to the results of PSG and BSI; the correlation between DSI results and each of these groups were analyzed. RESULTS: There were no statistically significant differences in obstruction levels between PSG data and DISE finding. Obese patients, positional-dependent OSA and sleep stage non-dependent OSA (NREM OSA) groups showed more obstruction on the lateral pharyngeal wall. Severe OSA groups showed more obstruction on tonsils. Obese patient groups revealed more obstruction on tongue base, but did not contribute to statistically significant results. CONCLUSION: In our study, obese patients, severe OSA, positional-dependent OSA and NREM OSA groups tended to exert greater influence on the obstruction of lateral pharyngeal wall. Surgeons should be aware of these findings when performing sleep surgery.