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Background: Several studies have examined the efficacy of gastric peroral endoscopic myotomy (G-POEM) for gastroparesis.Aim: To evaluate the mid-term efficacy of G-POEM by meta-analysis of studies with a minimum 1 year of follow-up. Methods:We reviewed several databases from inception to 10 June 2021 to identify studies that evaluated the efficacy of G-POEM in refractory gastroparesis, and had at least 1 year of follow-up. Our outcomes of interest were clinical success at 1 year, adverse events, difference in mean pre-and 1 year post-procedure Gastroparesis Cardinal Symptom Index (GCSI) score, and difference in mean pre-and post-procedure EndoFLIP measurements. We analysed data using a random-effects model and assessed heterogeneity by I 2 statistic. Results:We included 10 studies comprising 482 patients. Pooled rates (95% CI) of clinical success at 1 year and adverse events were 61% (49%, 71%) and 8% (6%, 11%), respectively. Mean GCSI at 1 year post-procedure was significantly lower than preprocedure; mean difference (MD) (95% CI) −1.4 (−1.9, −0.9). Mean post-procedure distensibility index was significantly higher than pre-procedure in the clinical success group at 40 and 50 mL volume distension; standardised mean difference (95% CI) 0.82 (0.07, 1.64) and 0.91 (0.32, 1.49), respectively. In the clinical failure group, there was no significant difference between mean pre-and post-procedure EndoFLIP measurements.Conclusions: G-POEM is associated with modest clinical success at 1 year. Additional studies with longer follow-up are required to evaluate its longer-term efficacy.

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ERCP is the first line of treatment for malignant biliary obstruction and EUS-guided biliary drainage (EUS-BD) is usually used for patients who have failed ERCP. EUS-guided gallbladder drainage (EUS-GBD) has been suggested as a rescue treatment for patients who fail EUS-BD and ERCP. In this meta-analysis, we have evaluated the efficacy and safety of EUS-GBD as a rescue treatment of malignant biliary obstruction after failed ERCP and EUS-BD. We reviewed several databases from inception to August 27, 2021, to identify studies that evaluated the efficacy and/or safety of EUS-GBD as a rescue treatment in the management of malignant biliary obstruction after failed ERCP and EUS-BD. Our outcomes of interest were clinical success, adverse events, technical success, stent dysfunction requiring intervention, and difference in mean pre- and postprocedure bilirubin. We calculated pooled rates with 95% confidence intervals (CI) for categorical variables and standardized mean difference (SMD) with 95% CI for continuous variables. We analyzed data using a random-effects model. We included five studies with 104 patients. Pooled rates (95% CI) of clinical success and adverse events were 85% (76%, 91%) and 13% (7%, 21%). Pooled rate (95% CI) for stent dysfunction requiring intervention was 9% (4%, 21%). The postprocedure mean bilirubin was significantly lower compared to preprocedure bilirubin, SMD (95% CI): −1.12 (−1.62–−0.61). EUS-GBD is a safe and effective option to achieve biliary drainage after unsuccessful ERCP and EUS-BD in patients with malignant biliary obstruction.

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