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Background Intravenous lidocaine has been shown to be an analgesic and anti-inflammatory medication with modulation of excessive inflammatory response. We investigated the efficacy of intraoperative lidocaine 2% infusion in reducing the postoperative Fentanyl requirements for analgesia in renal transplant recipients. Patients were assigned equally into two groups by computer-generated list compiled before the start of the study. Control group: fentanyl (F) group and study group: lidocaine 2% (L) group. Medication used is either lidocaine in the dose of 2 mg/kg/h and the other syringe contained saline both have been infused by rate of 10 ml/h. Fentanyl induction dose given for the two groups was 1.5 mcg/kg. Both groups have received extra fentanyl according to their intraoperative analgesic requirements, patients in the lidocaine group received the fentanyl induction dose accompanied by lidocaine 2% 1.5 mg/kg as loading dose, followed by maintenance dose of lidocaine 2% infusion 2 mg/kg/h. After transfer to the PACU nursing staff administered fentanyl 0.5 mcg/kg boluses for postoperative pain relief every 10 min up to 2 mcg/kg, the recovery nurse used the pain numerical score to assess pain. The recovery nurse referred the patient to the responsible anesthesiologist covering the recovery unit if he required more than 2 mcg/kg of fentanyl to control postoperative pain. Patient was then transferred to the RTU (renal transplant unit), postoperative pain and fentanyl PCA consumption were followed up during the first 24 h. Results Our study detected increased fentanyl consumption in the recovery for the fentanyl group more than the lidocaine group. The request of the first dose of analgesic was significantly longer in lidocaine group than in fentanyl group. Conclusion The usage of intraoperative lidocaine infusion decreased postoperative fentanyl requirements as analgesic in patients undergoing renal transplantation. Trial registration Registration on ANZCTR number ACTRN12618001335280 , REGISTERED 08 August 2018.

Intraoperative infusion of lidocaine 2% reduces postoperative fentanyl requirements for pain control in renal transplantation surgery