Samerchua A, Leurcharusmee P, Panichpichate K, et al. - In the present study, the researchers sought to contrast postoperative analgesic impacts between ultrasound-guided posterior quadratus lumborum block and ilioinguinal/iliohypogastric nerve block in pediatric inguinal herniotomy. For this randomized assessor-blinded study, one to seven-year-old children scheduled for unilateral open herniotomy have been randomly assigned to obtain either ultrasound-guided posterior quadratus lumborum block with 0.25% bupivacaine 0.5 ml/kg or ultrasound-guided ilioinguinal/iliohypogastric nerve block with 0.25% bupivacaine 0.2 ml/kg after induction of general anesthesia. This research involved 40 patients, after removing four disqualified cases. In the posterior quadratus lumborum block group, the number of patients who needed postoperative oral acetaminophen was significantly lower. Following open herniotomy in children, the posterior quadratus lumborum block with 0.25% bupivacaine 0.5 ml/kg gave better pain control than the ilioinguinal/iliohypogastric nerve block with 0.25% bupivacaine 0.2 ml/kg. In pediatric patients, the ultrasound guidance technique for the posterior quadratus lumborum block is safe and as easy as the ultrasound-guided ilioinguinal/iliohypogastric nerve block.