Abstract: For children suspected with lower gastrointestinal bleeding caused by colorectal polyps，using a colonoscopy to diagnose and treat has become very important. The main complications after polypectomy under colonoscope are bleeding，coagulation syndrome，and perforation. Compared with adults，children have a thin intestinal muscle layer，tender mucosa，and poor intestinal barrier function，but have fewer comorbidities and less use of anticoagulants. These characteristics determine the different risks and incidences of complications of post-polypectomy between children and adults. Pediatric endoscopists should take appropriate measures to prevent related complications according to the characteristics of children's polyps. This article will describe the risk factors，prevention，and management of bleeding，coagulation syndrome，and perforation after polypectomy in  children.

Key words: colonoscopy, polypectomy, post-polypectomy bleeding, post-polypectomy coagulation syndrome, perfora-tion, complication

摘要： 对于疑似因结直肠息肉而造成下消化道出血的患儿，使用结肠镜诊断及治疗已经成为非常重要的手段。肠镜下息肉切除术后主要并发症有：出血、电凝综合征和穿孔。与成人相比，儿童肠壁肌层薄、黏膜嫩、肠道屏障功能差，但合并症以及抗凝药使用少，这些特点决定了儿科内镜手术后并发症的相关风险及发生率与成人存在差别。儿科内镜医生需要根据患儿息肉的特点，采取相应措施预防相关并发症的发生。该文介绍了儿童结直肠息肉内镜治疗后出血、电凝综合征和穿孔的相关风险因素、预防及治疗措施。

关键词: 结肠镜, 息肉切除术, 出血, 电凝综合征, 穿孔, 并发症