Comparison of oxygen supplementation by nasal cannula with suction versus air insufflation without suction under drapes during monitored anesthesia care in adult cataract surgery-A randomized non-inferiority trial.

Background: Patients with multiple co-morbidities undergoing cataract surgery are at risk of hypoxia and hypercarbia secondary to the rebreathing of the accumulated carbon dioxide under the surgical drapes. They are also at risk of fire accidents due to the hyperoxic condition secondary to oxygen supplementation.

Objectives: The main aim of the study was to determine the lowest level of hemoglobin oxygen saturation while providing medical air in comparison with oxygen.