• Frances Chung, Barnaby Ward, Joyce Ho, Hongbo Yuan, Leonid Kayumov, and Colin Shapiro.
• Department of Anesthesiology, Toronto Western Hospital, University Health Network, University of Toronto, Toronto, Ontario, Canada M5T 2S8. frances.chung@uhn.on.ca <
• J Clin Anesth. 2007 Mar 1;19(2):130-4.

Study ObjectiveTo examine the prevalence of risk of sleep apnea in patients undergoing elective surgery by using the Berlin Questionnaire.DesignSurvey instrument.SettingsPreoperative assessment clinic.Patients305 surgical ASA physical status I, II, III, and IV patients.InterventionsPatients were screened with the Berlin questionnaire for obstructive sleep apnea. For patients deemed at high risk of sleep apnea by the Berlin questionnaire, a letter was sent to their family physician requesting referral of patient to have an overnight polysomnography test for the diagnosis of obstructive sleep apnea.MeasurementsThe number of patients identified by the Berlin questionnaire as being at high risk of obstructive sleep apnea was identified. The number of patients with a history of obstructive sleep apnea and those newly confirmed by polysomnography were also identified.Main ResultsThe Berlin questionnaire identified 24% (73/305) of patients as being at high risk of sleep apnea (95% confidence interval, 19%-29%). Thirteen patients were confirmed to have obstructive sleep apnea, resulting in a frequency of 4.2%; 9 patients had a history of obstructive sleep apnea, and 5 patients were identified by polysomnography.ConclusionsThe Berlin questionnaire correctly identified all patients previously diagnosed with sleep apnea as being at high risk.

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