RESUMO
In this study, according to the Location, Diameter, Risk factor (LDRf) classification principle, the influence and effect of esophageal varices diameter on the degree of complete ligation of multicyclic ligator were investigated. Methods. The esophageal veins of healthy piglets were filled with methylene blue solution, and the in vitro pig esophageal varices model was made, which were divided into three groups according to the diameter of esophageal varices: D1, 0.4-1.0 cm; D2, 1.1-1.5 cm; and D3, 1.6-2.0 cm. Finally, the ligation effect of each group was analyzed statistically. A total of 407 ligations were performed on the simulated esophageal variceal model. There were 103 ligations in the D1 group and 98 were complete (95.15%, 98/103); 151 ligations in the D2 group and 47 were complete (31.13%, 47/151); and 153 ligations in the D3 group but none were complete (0%, 0/153). There was significant difference in the degree of complete ligation between the two groups (χ2 = 38.0014, P ≤ 0.001). In the varicose ligation model, the complete ligation effect was the most complete and robust when the varicose diameter was 0.4-1.0 cm. This study showed that the varicose vein diameter in LDRf classification was reasonable and feasible to guide endoscopic varicose vein ligation.