Comparison of Fully Coated Anti-Reflux Metal Stenting and Per-Oral Endoscopic Myotomy in Patients with Achalasia: A Propensity Score- Matched Retrospective Study

Background: Achalasia is a rare primary esophageal motility disorder disease. It is reported that the long-term effect of fully coated anti-reflux metal stent (FCARMS) implantation is satisfactory. Operated by a skilled and experienced endoscopist, the effect of POEM treatment is equivalent to that of surgical myotomy. So far, there is still few evidence to prove stent implantation or POEM which is better for achalasia. The choice of treatment for achalasia is still controversial. Therefore, the aim of this study is to find a more suitable therapy for achalasia by comparing the efficacy of FCARMS implantation and POEM. Methods: A propensity score (PS) matching (1:2) was used in this retrospective cohort study. Data collected from consecutive patients of Achalasia, receiving FCARMS implantation or POEM therapy at the department of gastroenterology, the Seventh Medical Center of the Chinese People’s Liberation Army General Hospital from May 2007 to May 2018. According to their previous treatment, they are divided into two groups, FCARMS group and POEM group. Clinical efficacy and complications were compared between the two groups. Results: A total of 166 cases were collected, including 113 cases of FCARMS and 53 cases of POEM. By PS matching, 150 patients were enrolled (100 cases of FCARMS and 50 cases of POEM). By comparison, the FCARMS group has shorter operation time, shorter fasting time and lower hospitalization costs than the POEM group (p<0.05). Common complications in the FCARMS group are nausea, vomiting, and stent shift. Repetitions of gastroscopy in the FCARMS group was more often, which were 3.8±2.4（vs 2.1±1.8 of POEM）(p=0.00<0.05) The 6-month remission rates of the FCARMS combination POEM group were 89% and 94%, respectively (p=0.39), and the 2-year remission rates were 61% and 90%, respectively (p=0.00). Conclusions: Stent placement is a cost-effective and safe treatment option for achalasia. The short-term effect (less than 6 mons) of FCARMS is similar to that of POEM, the long-term effect (more than 2 years)，POEM is better than FCARMS. HRMⅡis most suitable for POEM treatment. It indicate that Patients can choose treatment methods according to their own conditions.