• Vijay S Khiani, Wajeeh Salah, Santo Maimone, Linda Cummings, and Amitabh Chak.
• Department of Medicine, Division of Gastroenterology, Yale University, New Haven, Connecticut, USA. vijay.khiani@gmail.com
• Gastrointest. Endosc. 2009 Dec 1;70(6):1116-20.

BackgroundObstructive sleep apnea (OSA) has become increasingly prevalent in the United States and often goes undiagnosed.ObjectiveTo assess the proportion of patients undergoing routine endoscopic procedures who are at risk of OSA and to determine whether these patients are at risk of sedation-related hypoxia.Design And SettingProspective case-control study at an academic medical center.Patients And InterventionsPatients undergoing routine EGD and colonoscopy were administered the Berlin Questionnaire, a brief validated survey that stratifies patients into high or low risk of OSA. Data on pulse oximetry and oxygen use were collected.Main Outcome MeasurementsRates of transient hypoxia, defined as a pulse oximetry measurement less than 92% requiring an increase in supplemental oxygen were compared between the high- and low-risk OSA groups.ResultsOf the 261 prospectively recruited patients, 28 were excluded for violating study protocol. Ninety (39%) of the remaining 233 patients were scored as being at high risk of OSA. There was no significant difference in the rate of transient hypoxia between the high- and low-risk groups (odds ratio 1.48; 95% CI, 0.58-3.80).LimitationsSingle-center study. OSA was not confirmed with a sleep study.ConclusionApproximately one third of patients undergoing routine outpatient endoscopic procedures at a university hospital scored as being at high risk of OSA. There was no significant difference in the rates of transient hypoxia between high- and low-risk groups, suggesting that the majority of patients with no diagnosis of OSA can undergo conscious sedation for routine endoscopic procedures with standard monitoring practices.

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