Oxygen supplementation during upper gastrointestinal endoscopy: A comparison of two methods

Abstract

The optimal method of oxygen supplementation during upper gastrointestinal endoscopy has not been clearly defined. The aim of this study was to compare oxygen supplementation via nasal prongs with that via a catheter passed into the low oropharynx to eliminate the effect of mouth breathing. Patients were stratified according to the American Society of Anesthesiologists (ASA) classification of physical status into lower-risk (ASA 1 and 2) and higher-risk (ASA 3) groups. The lower-risk group received intranasal, intrapharyngeal, or no oxygen supplementation, and higher-risk patients received either intranasal or intrapharyngeal oxygen. Continuous arterial oxygen saturation (SpO2) was recorded,..