Abstract: Objective  To study the effect of preventing swallowing of saliva on the visibility of upper gastrointestinal mucosa through education and other measures before gastroscopy.Methods  A prospective, randomized, singleblind, controlled clinical study was conducted on 400 patients who underwent gastroscopy to compare the upper gastrointestinal mucosa visibility score between research group and control group. Results  The total score of mucosal visibility in research group was significantly higher than that in control group (P<0.01). The mucosal visibility scores of all parts of upper gastrointestinal in research group were significantly higher than those in control group（P<0.05）. The proportion of patients with a mucosal visibility score≥3 in research group was significantly higher than that in control group（P<0.05）. Conclusion  Health education and other measures before gastroscopy can prevent patients from swallowing saliva and improve the visibility of the upper gastrointestinal mucosa.

Key words: gastroscopy, patient education, savila, gastric mucosa, lidocaine