Obesity hypoventilation syndrome in obstructive sleep apnea patients in the United Arab Emirates: a retrospective cross-sectional study.

Objectives: To estimate the frequency of symptoms of obesity hypoventilation syndrome (OHS) in patients with obstructive sleep apnoea (OSA) and to evaluate comorbidities associated with OHS.

Design: Retrospective study based on patients' medical records and on further sleep tests performed in the study centre during the inclusion visit.

Setting: Respiratory Care Unit and Sleep Disorder Centre of the Zayed Military Hospital United Arab Emirates.