Fig. 5
Mean value of tissue oxygen saturation at three zones of the gastric tube. Tissue oxygen saturation gradually decreased from the caudal side to the cranial side. No statistically significant differences in tissue oxygen saturation were found between the stomach zone and the anastomotic zone. However, there was a significant decrease in tissue oxygen saturation in the stomach tube tip zone compared to the anastomotic zone. These results suggest that oxygen saturation is maintained to some extent by intramural blood flow in the stomach in the gastroepiploic region beyond the end of the right gastroepiploic artery, but that it is difficult to maintain oxygenation beyond the demarcation line, resulting in a decrease in oxygen saturation