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Current practice guidelines recommend obstructive sleep apnea (OSA) patients to stay in the post anesthetic care unit (PACU) until the risk of respiratory depression has subsided. Inevitably, a greater demand on hospital resource utilization in these patients will increase health care cost. Polysomnography (PSG) and screening questionnaires can identify OSA but they are limited by accessibility and false positive results, respectively. Inaccurate OSA identification misguides postoperative surveillance plan. In contrast with MRI and CT scans, ultrasound is more accessible and more likely a practical tool for OSA screening. However, before clinical application, airway ultrasound (US) exam must undergo vigorous testing to check its utility, accuracy, inter-observer reliability and its ability to identify OSA and its severity.
Condition or disease
Obstructive Sleep Apnea
The investigators plan to recruit surgical patients at risk of OSA, exposed to sedatives,and/or general anesthesia. Surface ultrasound measurements will be conducted in a separate setting, and be correlated with the sleep study results, and a set of ultrasound parameters will be validated in this setting. Relevant clinical outcomes will be captured as well.
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Age>=18 American Society of Anesthesiologists (ASA) Physical System Classification 1-4 Suspected OSA / STOP-Bang questionnaire score for sleep apnea > 3 Referred for PSG / Had sleep study in past 1 year (amendment authorized 20/12/2017)
• failure to understand and provide consent
past history of oral, head and neck surgery (e.g., OSA corrective surgery)
active head & neck disease (e.g., cancer, infection and radiotherapy);
inability to perform breathing tests per instruction / on OSA treatment