Obstructive Sleep Apnea in Bariatric Surgical Patients

The potential patients will be screened by the STOP-Bang questionnaire. Those with a score ≥4 will be randomized into Sleep Study group or Oximetry group. The patients in the Sleep Study group will be referred to a sleep medicine specialist who is part of the Bariatric Surgery Psychosocial Program. In the Sleep Study group, patients will undergo sleep studies overnight in a sleep laboratory. At the same time, they will also wear the oximeter wristwatch to measure overnight oximetry. Depending on the sleep study results and medical history, a decision will be made regarding therapeutic options. If the patient has severe sleep apnea (AHI\>30) or moderate sleep apnea (AHI\>15 to \<30) with significant co-morbidities (e.g. cardiovascular disease, diabetes), CPAP treatment will be recommended. For mild sleep apnea (AHI\>5 to \<15) or moderate sleep apnea without significant co-morbidities, CPAP will not be required. If patient is not able to tolerate or refuses CPAP, dental device and positional therapy will be recommended. The patients in the Oximetry group will undergo overnight pulse oximetry. The patients with ODI\>10 events/hour will be referred to the sleep medicine specialist. Since the patients with ODI\>10 had a high probability 69%) to have moderate and severe OSA. A split- night PSG will be employed to confirm OSA diagnosis and to titrate CPAP with in patients with ODI\>10. The 1st part of the night will be a sleep study and depending on AHI, CPAP titration will be done for the 2nd part of the night. Compared to Sleep Study group, only one night instead of two nights of sleep studies is needed in patients with ODI\>10 events/hour. The patients with ODI ≤ 10 events/h will undergo surgery with routine care plus sleep apnea perioperative precautions.