Meperidine-Ketorolac Combination Provides Better Analgesia than Meperidine Alone in Postoperative Patients.

Background: Our study objective was to assess if multi-modal analgesia with meperidine-ketorolac combination provides superior analgesia or reduces opioid requirement following surgery compared to Meperidine alone.

Design: Double-blind randomized controlled trial.

Setting: Postoperative pain control in orthopedic ward after spinal anesthesia.

Patients: American Society of Anesthesiology (ASA) risk I or II (ASA I/II) patients who had lower limb implant surgery (88) at our center from September 2014 to July 2015.

Interventions: Patients were randomly assigned to receive either 1 mg/kg of intravenous (IV) meperidine and 30 mg of IV ketorolac (treatment group) or 1 mg/kg of IV meperidine (control group) post-surgery, administered every hour for the first 6 hours during the first 24 hours post-surgery. In addition, patients received intravenous meperidine on an 'as needed basis' during the first 24 hours of the postoperative period.

Measurements: Outcomes were time-to-first analgesia request postoperatively; cumulative opioid dose in first 24 hours post-surgery; frequency of side effects; and patient satisfaction with pain relief using a Likert scale. Numerical rating scale (NRS) pain scores hourly for the first 6 hours, then the 8th, 12th, 16th, 18th and 24th hour post-surgery were assessed.

Results: There was a significant delay in time of first request for analgesia (460 min vs 225 min; P=0.03) and a reduction in opioid consumption in 24 hours (299 mg vs 325 mg; P=0.01) in the meperidine/ketorolac group compared with the meperidine alone group which were both statistically significant. Patient satisfaction with pain relief was better in the treatment group (P=0.01). Additionally, there were fewer side effects in the treatment group than in the control group but this was not statistically significant.

Conclusions: Adding ketorolac to meperidine reduced postoperative pain, reduced patient daily opioid requirement, increased patient satisfaction with pain relief, without increasing the frequency of side effects. Therefore, IV ketorolac addition to opioids may be a reasonable option in multimodal analgesic protocol.