“…Five trials defined it as requiring a dose of morphine within the first 24 h, 12e14,18,24 two as requiring paracetamol, 10,15 one as requiring meperidine, 16 and three that described 'rescue analgesia' but did not specify a drug. 11,17,19 The number of patients requiring postoperative rescue analgesia was significantly lower in the BSCPB group compared with the control group during the first 24 h (OR: 0.30; 95% CI: 0.18, 0.51; P<0.00001). A subgroup analysis of analgesic requirements between preoperative and postoperative BSCPB was performed.…”