Peroral endoscopic myotomy and its use in non-achalasia disorders.

The aim of this review is to provide an overview of per-oral endoscopic myotomy (POEM) and its utilization in non-achalasia disorders of the esophagus. POEM, a relatively novel endoscopic technique, involves submucosal tunneling to access esophageal muscle layers, enabling selective myotomy and mitigating the consequences of motor disorders of the esophagus. POEM is an effective treatment modality for diffuse esophageal spasm providing resolution of chest pain and dysphagia in a majority of patients who have refractory symptoms despite medical therapy. The results of POEM are more equivocal compared to esophagogastric junction outflow obstruction (EGJOO). POEM in EGJOO has been shown to have a 93% clinical success rate in 6 months. POEM appears to be more effective in motor disorders that affect the lower esophageal sphincter, such as EGJOO and opioid-induced esophageal dysfunction. While the current data for POEM in other entities such as DES and HE are positive, more supportive data are required to make POEM a consistent recommendation for patients.