Journal of Ear Nose Throat and Head Neck Surgery, cilt.33, sa.3, ss.85-91, 2025 (Scopus)
Objective: The aim of the study was to evaluate the sleep depth of patients at the minimum oxygen saturation (minSO2) level and the level of airway obstruction during drug-induced sleep endoscopy (DISE). To also evaluate the effects of polysomnography (PSG) and DISE findings on surgical planning and patient outcome. Material and Methods: Analysis of patients who presented with Obstructive Sleep Apnea Syndrome between July 2017-and-December 2019 was performed in a tertiary referral hospital. With a Bispectral Index (BIS) monitoring, the sleep depth of the patients at the level of airway obstruction detected during DISE and at minimum oxygen saturation (minSO2) was recorded by Bispectral Index (BIS) monitoring. Clinical characteristics, PSG results, physical examination, and DISE findings were assessed. Results: Obstruction was most common in the retropalatal region in patients who underwent DISE. The BIS values during the minSO2 of all patients during DISE ranged from 41-80, with an average of 59.76±7.21. The BIS values during snoring were between 38-85, with an average of 70.94±8.00. The BIS value during obstruction ranged from 38-85, with an average of 61.58±7.00. Conclusion: DISE is a valuable diagnostic tool for examining the upper airway during sedation mimicking sleeping, to identify structures that contribute to airway obstruction. Our study showed that as the sleep depth of the patients changes, the level and degree of obstruction detected in DISE will change. Therefore, it is important to evaluate the patients in the sleep depth closest to physiological sleep during DISE.