Ultrasound-guided Lumbar Erector Spinae Plane Block Versus Caudal Block for Postoperative Analgesia in Pediatric Hip and Proximal Femur Surgery: a Randomized Controlled Study

Background: According to previous research, 20% of infants experience prolonged postsurgical pain 6-12 months after major surgery, which is linked to functional impairment and a lower quality of life. The aim of our study is to evaluate whether the analgesic effect of the erector spinae plane block (ESPB) is superior to that of caudal epidural anesthesia (CEA) in pediatric patients undergoing hip or proximal femoral surgeries.

Methods: Seventy-six children ranging in age from 1 to 7 years scheduled for hip or proximal femur surgery were randomly assigned to receive either a unilateral ultrasound-guided ESPB or CEA with bupivacaine 0.25% at a dose of 0.5 ml/kg. The primary outcome was the Face, Legs, Activity, Cry, and Consolability (FLACC) scale 2 h postoperatively. The secondary outcomes were pain scores every 15 min for the first hour and then at 6, 12, and 24 h postoperatively; the block failure rate; time to perform a successful block; and time to first rescue analgesia.

Results: The FLACC score 2 h post¬operatively was not superior in the ESPB group compared to the CEA group; indeed, it was significantly higher in the ESPB group at 15 and 30 min post-operation (P = 0.005, 0.004, respectively). Additionally, the time to first rescue analgesia was prolonged in the CEA group (P < 0.001). The time to perform a successful block was comparable between the groups.

Conclusions: The analgesic effect of the ESPB was not superior to that of CEA in pediatric patients undergoing hip and proximal femur surgery.