Abstract:Objective To investigate the clinical application value of electronic colonoscopy in children with lower gastrointestinal bleeding and the feasibility of gastroscopy instead of colonoscopy.Methods A retrospective analysis of 267 cases of children with lower gastrointestinal bleeding from January 2017 to March 2020 was made, and the etiology and colonoscopy results were summarized.Results Preschool children account for 69.29%. The common non infectious diseases of lower gastrointestinal bleeding in children are intestinal polyps, colitis, inflammatory bowel disease, allergic colitis, allergic purpura and Meckel diverticulum. For intestinal polyps, IBD, eosinophilic gastroenteritis, allergic colitis and Behcet's disease, the positive rate was 100.00%. 29 cases were treated with endoscopic local hemostasis, and 100 cases of intestinal polyps were treated by high frequency electrocoagulation under endoscope. 267 children were examined by electronic colonoscopy 268 times, that total colonoscopy was performed in 234 cases. The total cecal intubation rate was 87.31%. Among them, 227 cases were examined by electronic colonoscopy (the cecal insertion rate was 90.31%), and 41cases were performed by gastroscopy instead of colonoscopy (the cecal insertion rate was 70.73%).Conclusion Electronic colonoscopy is safe and effective in the diagnosis and treatment of lower gastrointestinal bleeding in children,and different causes of gastrointestinal bleeding show different under colonoscopy, it is safe and feasible to use gastroscope instead of colonoscopy for children under 1 year old or with weight less than 10 kg.