Results: We found 16 studies that provided data on 551 patients. The median surveillance period was 6 months (range: 3–12). The median of mean POEM duration was 156 minutes (range: 42–112). Median myotomy length was 10cm (range: 6–14). Technical and clinical success were reported in 97% (95% CI: 94–98%) and 93% (407/428; 95% CI: 90–95%). No heterogeneity (I2¼0%) or publication bias was present in both estimates. When limiting the analysis only to adverse events that require medical or surgical interventions, major adverse events occurred in 14% (95% CI: 11–17%); however, only one patient needed post-POEM surgery (0.2%; 95% CI: 0–0.5%).