• Lisa Sangkum, Chama Wathanavaha, Visasiri Tantrakul, Munthana Pothong, and Cherdkiat Karnjanarachata.
• 270 Department of Anesthesiology, Faculty of Medicine, Ramathibodi hospital, Mahidol University, Rama VI road, Phayathai, Ratchatewi, Bangkok, 10400, Thailand. lisa.sangkum@gmail.com.
• BMC Anesthesiol. 2021 Apr 27; 21 (1): 132.

BackgroundUndiagnosed obstructive sleep apnea (OSA) is associated with adverse perioperative outcomes. The STOP-Bang questionnaire is a validated screening tool for OSA. However, its precision may vary among different populations. This study determined the association between high-risk OSA based on the modified STOP-Bang questionnaire and perioperative adverse events.MethodsThis cross-sectional study included patients undergoing elective surgery from December 2018 to February 2019. The modified STOP-Bang questionnaire includes a history of Snoring, daytime Tiredness, Observed apnea, high blood Pressure, Body mass index > 30 kg/m2, Age > 50, Neck circumference > 40 cm, and male Gender. High risk for OSA was considered as a score ≥ 3.ResultsOverall, 400 patients were included, and 18.3% of patients experienced perioperative adverse events. On the basis of modified STOP-Bang, the incidence of perioperative adverse events was 23.2 and 13.8% in patients with high risk and low risk (P-value 0.016) (Original STOP-Bang: high risk 22.5% vs. low risk 14.7%, P-value 0.043). Neither modified nor original STOP-Bang was associated with perioperative adverse events (adjusted OR 1.91 (95% CI 0.99-3.66), P-value 0.055) vs. 1.69 (95%CI, 0.89-3.21), P-value 0.106). Modified STOP-Bang ≥3 could predict the incidence of difficult ventilation, laryngoscopic view ≥3, need for oxygen therapy during discharge from postanesthetic care unit and ICU admission.ConclusionsNeither modified nor original STOP-Bang was significantly associated with perioperative adverse events. However, a modified STOP-Bang ≥3 can help identify patients at risk of difficult airway, need for oxygen therapy, and ICU admission.Trial RegistrationsThis study was registered on Thai Clinical Trials Registry, identifier TCTR20181129001 , registered 23 November 2018 (Prospectively registered).

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