“…There were twenty RCTs ( 22 – 25 , 27 – 32 , 34 , 36 – 39 , 41 – 45 ) that compared ESPB with placebo, six studies ( 23 , 26 , 33 , 35 , 39 , 40 ) that compared ESPB with TAPB. Abdominal surgeries were performed under general anesthesia in all studies: in nine studies ( 25 , 26 , 28 , 33 , 37 , 40 , 42 – 44 ) for LC, in four studies ( 27 , 31 , 34 , 41 ) for PCNL, in three studies ( 23 , 38 , 45 ) for BS, in two studies ( 30 , 36 ) for laparoscopic hepatectomy (LH), in two studies ( 32 , 35 ) for total abdominal hysterectomy, in one study ( 22 , 24 ) for hernia repair, in one study ( 22 ) for open nephrectomy, in one study ( 29 ) for open radical prostatectomy and in one study ( 39 ) for emergency laparotomy. Moreover, in the majority (20 of the 24) of the studies ( 22 – 27 , 29 – 34 , 36 – 40 , 42 , 43 , 45 ), ESPB was performed before the surgery.…”