Recent Advances in Third-Space Endoscopy.

Area of Science:

• Gastroenterology
• Interventional Endoscopy
• Surgical Innovation

Background:

• Interventional gastrointestinal endoscopy has advanced significantly, enabling new therapeutic approaches.
• Submucosal endoscopy, or third-space endoscopy, leverages the submucosal space for novel procedures.
• Technological improvements facilitate the translation of research findings into clinical practice.

Purpose of the Study:

• To review the advancements and applications of third-space endoscopy.
• To highlight the techniques and potential indications for submucosal endoscopic procedures.
• To discuss the safety profile and limitations of current third-space endoscopy techniques.

Main Methods:

• Submucosal tunnel creation followed by myotomy or tumor dissection is the core technique.
• Procedures discussed include peroral endoscopic myotomy (POEM) for achalasia and subepithelial tumor resection.
• Potential applications in refractory gastroparesis, Zenker diverticulum, and esophageal obstruction were considered.

Main Results:

• Peroral endoscopic myotomy and subepithelial tumor removal are initial successful applications of third-space endoscopy.
• Emerging data for POEM and pyloromyotomy are promising, though long-term randomized data are limited.
• The majority of third-space endoscopy procedures are safe and can be performed in an endoscopy suite.

Conclusions:

• Third-space endoscopy represents a significant advancement in gastrointestinal interventions.
• While generally safe, common adverse events include insufflation-related issues, bleeding, and perforations.
• Further randomized trials with long-term follow-up are necessary to fully establish the efficacy of these procedures.