Sedation for endoscopic submucosal dissection places patients at risk of desaturation, and high-flow nasal oxygen may reduce the risk. The aim of this study is to evaluate the role of high-flow nasal oxygen during endoscopic submucosal dissection. We will compare the incidence of hypoxemia (defined as SpO2 lower than 90%) of conventional nasal oxygen cannula group and that of high-flow humidified oxygen-delivery system group during the procedure.
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The incidence of hypoxemia (SpO2 lower than 90%) measured with pulse oximetry during the procedure
Timeframe: during the procedure (from the start to the end of the endoscopic submucosal dissection), 1hour