The total number of pethidine injections in first 24 hours postoperatively was 0.6 ± 0.6 in the ketamine group and 2.0 ± 0.8 in the control group (P = 0.032).
received 0.5 mg/kg of ketamine IV 10 minutes before the surgical incision
0.5 mg/kg of normal saline was injected
The interval time for the first analgesic request