Effect of posterior quadratus lumborum blockade on the quality of recovery after major gynaecological laparoscopic surgery: A randomized controlled trial

Bilateral quadratus lumborum blockade (QLB) using ultrasound guidance has been introduced as an abdominal truncal block to improve postoperative analgesia and quality of recovery (QoR) after abdominal surgery, but efficacy remains controversial. The primary aim of this study was to evaluate the efficacy of posterior QLB on the postoperative QoR, and secondarily to evaluate postoperative pain after gynaecological laparoscopic surgery (LS). This study was a singlecentre randomized controlled trial. QLB group patients underwent bilateral posterior quadratus lumborum injections with 25-30 mL of 0.25% levobupivacaine after induction of general anaesthesia; the control group underwent no block. Both groups were administered fentanyl-based intravenous patient-controlled analgesia postoperatively. The postoperative QoR was measured using the Quality of Recovery 40 (QoR-40) questionnaire score; postoperative pain was evaluated using the visual analogue scale (VAS) and the cumulative postoperative fentanyl dose. Thirty-one and 29 patients were randomised to the QLB and control groups, respectively. The intraoperative remifentanil dosage was significantly less in the QLB group. The median (interquartile range) for the QoR-40 score was not different between the groups: 154 (133-168) in the QLB group and 158 (144-172) in the control group. There were no statistically significant differences in secondary outcome variables. Single-shot QLB did not improve the QoR or postoperative pain in patients managed by multimodal analgesia after gynaecological LS.