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Obesity and Obstructive Sleep Apnea in the Ambulatory Patient. Obesity and obstructive sleep apnea (OSA) are often associated with increased perioperative risks and challenges for the anesthesiologist. This article addresses the current controversies surrounding perioperative care of morbidly obese patients with or without OSA scheduled for ambulatory surgery, particularly in a free-standing ambulatory center. Topics discussed include preoperative selection of obese and OSA patients for ambulatory surgeries, intraoperative methods to reduce perioperative risk, and appropriate postoperative care.