​ Conditions: General Anesthesia; Surgery; Dexmedetomidine; Esketamine; Quality of Recovery

Interventions: Drug: Dexmedetomidine; Drug: Esketamine; Drug: Dexmedetomidine-esketamine; Drug: Placebo

Sponsors: Peking University First Hospital

Not yet recruiting Conditions: General Anesthesia; Surgery; Dexmedetomidine; Esketamine; Quality of Recovery
Interventions: Drug: Dexmedetomidine; Drug: Esketamine; Drug: Dexmedetomidine-esketamine; Drug: Placebo
Sponsors: Peking University First Hospital
Not yet recruiting