903 Clinical Efficacy of Gastric Per-Oral Endoscopic Myotomy in the Treatment of Refractory Gastroparesis and Predictors of Successful Outcomes: A Systematic Review and Meta-Analysis

Abstract

INTRODUCTION: Options to treat medically refractory gastroparesis are limited. Gastric peroral endoscopic myotomy (G-POEM) is a novel minimally invasive technique in endosurgery that has shown promising results. Data is limited as to its efficacy, safety, predictive factors and its comparability to surgical pyloroplasty. The aim of our study was to synthesize and analyze the clinical outcomes of GPOEM by meta-analysis methods. METHODS: We searched multiple databases from inception through March 2019 to identify studies that reported on G-POEM and surgical pyloroplasty in gastroparesis. Our primary outcome was to analyze the pooled rates of gastroparesis cardinal symptom index (GCSI) score and 4-hr gastric emptying study (GES) results, with G-POEM. Similar outcomes with surgical pyloroplasty was used as a comparator group. RESULTS: 332 and 375 patients underwent G-POEM (11studies) and pyloroplasty (7studies), respectively. The pooled rate of clinical success, based on the GCSI score, with G-POEM was 75.8% (95% CI 68.1-82.1, I2 = 50) and with pyloroplasty was 77.3% (95% CI 66.4-85.4, I2 = 0), with no significance,P = 0.81. The pooled rate of clinical success, based on the 4-hour GES results, with GPOEM was 85.1% (95% CI 68.9-93.7, I2 = 74) and with pyloroplasty was 84% (95% CI 64.4-93.8, I2 = 81), with no significance, P = 0.91. The pooled rate of mean pre-G-POEM GCSI score was 3.4 (95% CI 3.1-3.7, I2 = 89) and post-G-POEM GCSI score was 1.8 (95% CI 1.4-2.1, I2 = 89), with statistical significance (P = 0.001). The pooled pre-G-POEM 4-hr GES was 49.9% (95% CI 41.6-58.3, I2 = 94) and post-G-POEM 4-hr GES was 20.6% (95% CI 12.3-28.8, I2 = 77), with statistical significance (P = 0.001). The pre and post pyloroplasty 4-hr GES results were 36% (95% CI 32.7-39.3, I2 = 88) and 3.9% (95% CI 2.3-5.5, I2 = 43), respectively (P = 0.001). The pre and post pyloroplasty GCSI score was not analyzed due to paucity in data. The overall adverse events were comparable (11%, 5.9-19.8, I2 = 66 vs 11.4%, 5-24, I2 = 69, P = 0.95). Based on meta-regression analysis, idiopathic-gastroparesis, prior treatment with botulinum toxin and gastric-stimulator seemed to predict clinical success with G-POEM. CONCLUSION: G-POEM demonstrates clinical success in treating refractory gastroparesis with comparable outcomes to pyloroplasty. Idiopathic gastroparesis, prior treatment with botulinum injection and gastric stimulator appear to have positive predictive effects on the 4-hr GES results after G-POEM.