Peroral Endoscopic Myotomy

The procedure targets the muscular abnormality responsible for impaired food passage. When the lower esophageal sphincter fails to relax, cutting selected circular fibers reduces resistance at the esophageal entrance to the stomach. For spastic disorders, the myotomy can address excessive or uncoordinated contraction in selected esophageal muscle segments, matching treatment to the underlying motility pattern.

Circular muscle fibers contribute substantially to the narrowing that controls passage into the stomach. Including the lower esophageal sphincter in the targeted myotomy can reduce the functional obstruction created by inadequate relaxation. Focusing on selected fibers, rather than treating the entire esophageal wall indiscriminately, allows the intervention to address the muscular component linked to swallowing difficulty.

The submucosal tunnel provides an internal route for the endoscope to reach and divide the deeper circular muscle fibers. A small mucosal entry point permits this access while avoiding an external incision. This design is central to the minimally invasive character of the technique and enables treatment within the esophageal wall.

POEM represents an endoscopic alternative to both surgical myotomy and pneumatic dilation for appropriate swallowing disorders. Its distinguishing feature is direct division of targeted muscle fibers through an internal endoscopic route, rather than treatment through external surgery or dilation alone. The development of this option has broadened the therapeutic choices available for achalasia.

The described workflow begins with endoscope entry through the mouth and a small incision in the esophageal mucosa. The endoscope then advances through a submucosal tunnel toward the relevant muscular region. Finally, the operator cuts selected circular fibers, including those at the lower esophageal sphincter when indicated, to improve passage toward the stomach.

Achalasia is the primary application, but selected spastic esophageal disorders may also be considered when excessive contraction contributes to swallowing symptoms. The relevant decision depends on whether the muscular pattern is suitable for targeted myotomy. Thus, the technique can be applied beyond one diagnosis while remaining focused on disorders involving abnormal esophageal muscle function.

By reducing muscular resistance in the affected esophageal region, POEM can provide relief from swallowing symptoms. Its use without external incisions has also helped expand therapeutic endoscopy, showing how endoscopic access can support definitive muscle-directed treatment. In medicine, the technique is significant both as an option for achalasia and as an alternative to established interventions.