Supplemental Oxygen and Oxygen Desaturations in Colonoscopies

This study will compare apnea and oxygen desaturation events among various methods of supplemental oxygen delivery during procedural sedation in colonoscopy patients. The goals of the study are to track apnea (10 or more seconds without respiration) and oxygen desaturation (hemoglobin oxygen saturation less than 90%) events in colonoscopy patients receiving one of three different methods of supplemental oxygen administration. The first method is standard-of-care continuous flow oxygen therapy, where a constant flow of oxygen is administered through a nasal cannula or oxygen mask. The second method is synchronized flow oxygen therapy. This is a delivery method implemented in an FDA-cleared medical device (Sovant, Dynasthetics LLC) which delivers variable-volume oxygen pulses only as the patient inhales. The delivered oxygen pulses are commensurate to the set flow rate and the patient's respiratory rate. The third method is continuous positive airway pressure therapy (CPAP), where non-invasive pressure support is given to the patient's airway to help keep their airway open. The hypothesis being tested is that synchronized flow delivery and CPAP therapy will demonstrate reductions in apnea and oxygen desaturation events compared to traditional continuous flow oxygen therapy.