Esketamine group was induced with esketamine 0.5 mg/kg, propofol 2 mg/kg, and rocuronium bromide 0.9 mg/kg. Anesthesia is maintained with propofol 5 mg/kg/h and esketamine 0.5 mg/kg/h. Anesthesia induction in the opioid group Sufentanil 0.5 ug/kg, propofol 2 mg/kg, rocuronium bromide 0.9 mg/kg. Anesthesia is maintained with propofol 5 mg/kg/h and remifentanil 1 ug/kg/h.