• Philip Wai Yan Chiu, Justin Che Yuen Wu, Anthony Yuen Bun Teoh, Yawen Chan, Simon Kin Hung Wong, Shirley Yuk Wah Liu, Man Yee Yung, Candice C H Lam, Joseph Jao Yiu Sung, Francis Ka Leung Chan, James Yun Wong Lau, and Enders Kwok Wai Ng.
• Departments of Surgery and Medicine and Therapeutics, Institute of Digestive Disease, The Chinese University of Hong Kong, Shatin, Hong Kong. philipchiu@surgery.cuhk.edu.hk
• Gastrointest. Endosc. 2013 Jan 1; 77 (1): 29-38.

BackgroundPeroral endoscopic myotomy (POEM) is a novel approach to performing esophageal myotomy through a long submucosal tunnel.ObjectiveThis study aimed to investigate the feasibility and safety of POEM for treatment of achalasia.DesignPreclinical animal study and prospective clinical study.PatientsConsecutive patients diagnosed with achalasia with high-resolution manometry.InterventionsPOEM was standardized for preclinical and clinical studies. After submucosal injection, a mucosal incision was made 15 cm above the gastroesophageal junction (GEJ). A long submucosal tunnel was created to extend below the GEJ. The endoscopic myotomy started 10 cm above and extended 2 cm below the GEJ. We first conducted a preclinical animal study to confirm the safety of POEM. POEM was then performed for the treatment of achalasia in humans.Main Outcome MeasurementsRelief from dysphagia assessed by the dysphagia score and Eckhardt score. High-resolution manometry and pH monitoring were performed to evaluate the posttreatment effects and esophageal acid exposure.ResultsSeven 30-kg porcine models underwent POEM in the survival study. All of the pigs survived except 1, which sustained pneumomediastinum. POEM was performed for the treatment of achalasia in 16 patients. The mean operating time was 117.0 ± 34.1 minutes. All patients tolerated food on day 2, with a contrast study confirming no leakage. The median follow-up was 176.5 days (range 98-230 days). The postoperative basal lower esophageal sphincter pressure was significantly reduced (mean reduction, 13.9 ± 14.5 mm Hg; P = .005) and 4-second integrated relaxation pressure of the GEJ (mean reduction, 10.1 ± 7.4 mm Hg; P = .001). Of these patients, 58.3% had a normalized 4-second integrated relaxation pressure, whereas 20% had excessive esophageal acid exposure after the procedure. There was a significant improvement in quality of life 6 months after POEM measured by the Short Form-36 questionnaire.LimitationSmall sample size.ConclusionsPOEM is a feasible, safe, and effective treatment for achalasia.Copyright © 2013 American Society for Gastrointestinal Endoscopy. Published by Mosby, Inc. All rights reserved.

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