The study focuses on patients who may experience hypoxemia—a condition where blood oxygen levels become too low—while undergoing digestive endoscopy procedures such as gastroscopy, colonoscopy, or oral endoscopic ultrasound performed under deep sedation. The intervention being tested is the delivery of high-flow oxygen therapy using a medical oxygen gas, which provides a higher rate of oxygen to help keep blood oxygen levels stable during the procedure.

The purpose of the study is to determine whether this oxygen approach reduces the number of low‑oxygen events and related complications during sedated endoscopic examinations. Participants will be randomly assigned to receive either the high‑flow oxygen or the standard oxygen method, and they will be observed throughout the endoscopic procedure and the short recovery period. Researchers will monitor for signs such as abnormal breathing patterns measured by capnography (a test that tracks carbon dioxide in the breath), as well as heart‑related issues including bradycardia (slow heart rate), hypotension (low blood pressure), arrhythmias (irregular heartbeats), pulmonary aspiration (inhaling fluids into the lungs), and cardiorespiratory arrest (stopping of heart and breathing).

Data will be collected during the endoscopic session and shortly afterward to evaluate the safety and effectiveness of the high‑flow oxygen approach compared with the standard method, with the goal of improving patient safety during these procedures.