TREATMENT OUTCOME OF UNDERWATER ENDOSCOPIC MUCOSAL RESECTION OF COLON POLYPS IN A SINGLE INSTITUTION

Aims Underwater endoscopic mucosal resection (UEMR) is emerging new technique to removal colon polyps. We aimed to elucidate efficacy and safety of UEMR to removal of various type of colon polyps

Methods Sixty-six colon polyps on twenty-six patients who underwent UEMR at Chonnam National University Hospital from January 2019 to August 2019 were analyzed retrospectively.

Results Ten patients (38.5%) were female, with a mean age of 61.6 years. The mean polyp variable per patient was 2.54 (range 1–20). The average size of the polyps is 9.1 mm (range 5–30). Sessile type (86.4%) was most common type followed by semi-pedunculated type (9.1%) and pedunculated type (4.5%). Sigmoid colon (36.4%) was most common polyp location followed by transverse colon (22.7%). The average procedure time per polyp is 191 ± 257 seconds. Coagrasper (7.6%), argon plasma coagulation (3.5%) and hemoclip (4.5%) were used in some cases. Most common histologic diagnosis was low grade dysplasia (72.7%). En-bloc ablation was achieved at 90.9%. And R0 ablation was achieved at 86.5% (45/52). Immediate bleeding was observed at 10.6% per polyp. No delayed bleeding or perforation was observed. In one case, pneumonia occurred during hospitalization.

Conclusions UEMR is a safe and effective way to remove various types of colon polyps. Further evaluation is needed to compare the effectiveness and safety with conventional endoscopic mucosal resection.