Effect of Preventive Analgesia with Oxycodone and Parecoxib Sodium on the Chronification of Acute Post-operative Pain

Participants will receive 0.1ml/kg oxycodone (1mg/ml) and 2 ml parecoxib sodium (20 mg/ml) combinations after the anesthesia induction but before the surgical incision. Oxycodone is administered 5 minutes after parecoxib sodium administration.

Participants will receive 0.1ml/kg placebo (0.9% saline) and 2 ml parecoxib sodium (20 mg/ml) combinations after the anesthesia induction but before the surgical incision. Placebo is administered 5 minutes after parecoxib sodium administration.