Chemically assisted peroral endoscopic myotomy with submucosal mesna injection in a porcine model

Abstract

Background: Peroral endoscopic myotomy (POEM) is a less invasive alternative to standard surgery for the treatment of achalasia. Previous studies have demonstrated that submucosal injections of mesna soften tissues and facilitate endoscopic submucosal dissection. Material and methods: We studied the technical feasibility of a chemically assisted POEM procedure with mesna injection (CA-POEM) in ten pigs compared with POEM with saline injection in five pigs. We also compared two dissection techniques in CA-POEM, diathermy needle knife dissection (n = 5) and balloon mechanical dissection (n = 5). A 10 cm esophageal submucosal tunnel was created with a needle knife or with balloon mechanical dissection following mesna or saline submucosal injection. Approximately 5 cm of inner circular muscle was then dissected within the tunnel. The tunnel was closed with endoclip application at the mucosal endoscopic entry point. Pigs were sacrificed one week post procedure. Results: All procedures were successful and all pigs survived for one week. Submucosal tunneling time was significantly shorter in the mesna group (363.8 sec for needle knife dissection and 294.2 sec for balloon dissection) than in the saline group (640 sec), regardless of the dissection method (p < 0.05). Conclusions: Our study demonstrated the technical feasibility of CA-POEM.

Key words:

• POEM
• mesna
• NOTES
• animal study

Acknowledgements

My heartfelt appreciation goes to Dr. Masayuki Kato whose comments and suggestions were of inestimable value for our study. We also received generous support from Dr. Tomohiko Ohya, Dr. Akira Dobashi, Dr. Masakuni Kobayashi, and Dr. Shunsuke Kamba.

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.