Fig. 8From: Analgesic efficacy and safety of erector spinae versus serratus anterior plane block in thoracic surgery: a systematic review and meta-analysis of randomized controlled trialsForest plot for the successful block in the first attempt. RR Relative risk, CI Confidence interval, M–H Mantel Haenszel, SD Standard deviation, ESPB Erector spinae plane block, SAPB Serratus anterior plane blockBack to article page