Objective To explore the effectiveness of a self-developed pH-monitoring gastric tube to guide the operator to locate the tip position by using pH gradient method. Methods Forty-one healthy subjects who underwent painless gastroscopy at the Digestive Endoscopy Center of the First Medical Center of PLA General Hospital from September 2022 to February 2023 were selected. After general anesthesia,gastric tubes were inserted under gastroscopy. The pH values corresponding to the arrival of the tip of the new type of gastric tubes to the esophagus,cardia,stomach,pylorus and duodenum were observed and recorded,and the pH values corresponding to different positions were plotted. A new procedure of gastric tube placement was constructed based on pH gradient method. The participants were randomly assigned to receive a gastric tube inserted by either the pH gradient method （experimental group） or the traditional method （control group）. The accuracy of the tip position of the gastric tubes,the success rate of one insertion, the operation time, the incidence of adverse reactions and other indicators of the two methods were compared to evaluate the effectiveness of the pH gradient method in the process of the new gastric tube insertion. Results When the new gastric tube moved through the esophagus to the lower edge of LES or near the cardia, 8 cases showed a significant gradient of pH value decline. The accuracy rate of the placement of the gastric tube in the experimental group was 87.8%,which was higher than 34.1% in the control group,and the difference was statistically significant （P<0.05）. The success rate of one-time catheterization in the experimental group was 80.5%, which was higher than 78.0% in the control group,but there was no statistical significance between the two groups. The time required for gastric tube placement in the experimental group （99.98±38.60）s was significantly lower than that in control group （147.78±58.76）s, and the difference was statistically significant （P<0.05）. After gastric tube insertion,there were （3.80±0.51）and （2.85±1.15）lateral pores in the stomach of the experimental group and the control group respectively, and the difference was statistically significant （P<0.05）. There was no significant difference in coughing and curling during the catheterization process. Conclusions The new type of gastric tube that can dynamically monitor the pH value at the tip of gastric tube can improve the accuracy of gastric tube placement position,the success rate of one-time catheterization and the efficiency catheterization, without increasing the complications related to gastric tube placement.
Key words
nnew type of gastric tube /
gastric tube retention /
tip positioning of gastric tube /
pH gradient /
gastric fluid pH monitoring
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