Early experience with use of an endoscopic "hot" scissor-type knife for myotomy during per-oral endoscopic myotomy procedure.

Background And Aims: Current devices used for per-oral endoscopic myotomy (POEM) function predominantly to either cut tissue or coagulate vessels. When bleeding vessels are encountered within the submucosa or muscle, dedicated coagulation grasping devices are often necessary. An endoscopic "hot" scissor-type knife is available that combines coagulation and cutting functions. Scissor-type knives may therefore be helpful during the POEM procedure.

Methods: We report 4 cases of achalasia that were treated by the POEM procedure using the Stag Beetle scissor-type knife for myotomy. Patients were identified from a prospectively maintained database of patients undergoing POEM at our center between September and October 2017. A single operator (K.J.C.) performed all of the procedures using both a hybrid knife and an SB knife. Demographic and clinical data were collected for all patients.

Results: All 4 POEM procedures were performed successfully without any adverse events. Only 3 spontaneous bleeding episodes occurred among the 4 procedures, and no perforation occurred. The patients were all doing very well at clinic follow-up at 4 weeks.

Conclusions: The technique of using the SB knife during myotomy during the POEM procedure is feasible and appears safe. Muscle tissue and blood vessels can be coagulated and cut simultaneously, reducing bleeding and improving control. Further comparative studies are warranted to evaluate the efficacy, safety, and cost effectiveness against existing techniques.