Effect Study of Parecoxib to Treat Emergence Delirium and Postoperative Pain

The study group will receive first dose of intravenous (IV) injection of parecoxib sodium 40 mg (in a volume of 2 ml) 60 min before the anticipated end of surgery, followed 2 ml IV injection of parecoxib 40 mg will be occurred at 12, 24 and 36 h after the first dose of parecoxib.