Introduction
hypoxia
HYPOXIA
Mask ventilation before tracheal intubation has been considered essential to prevent hypoxia in patients [During laparoscopic surgery, if the stomach is inflated excessively due to inadequate mask ventilation, it obstructs the surgeon’s view of the operation, making the operation more difficult and longer. In severe cases, artificial decompression through a Levin tube is required. Therefore, proper mask ventilation is necessary to prevent air inflow into the stomach and improve the operating view.The gastric antral cross-sectional area (CSA) using gastric ultrasound can be measured more easily than other locations (body or fundus) in the stomach and is closely correlated with gastric content volume [There have been studies confirming gastric contents through gastric ultrasound [