Obstructive Sleep Apnea and Obesity Hypoventilation Syndrome

Sleep-disordered breathing affects approximately 20 % of adults and is even more common among patients preparing for surgery. 7 % of adults have moderate or severe obstructive sleep apnea (OSA). A small subset of these patients suffer from obesity hypoventilation syndrome (OHS), defined as awake hypoventilation in the setting of obesity and sleep-disordered breathing. The prevalence of OHS is 0.15–0.3 % in adults, but up to 8 % in patients preparing for bariatric surgery.