Department of Anesthesiology Ninth People''s Hospital Shanghai Jiao Tong University School of Medicine 201999;
Department of Anesthesiology Ninth People''s Hospital Shanghai Jiao Tong University School of Medicine 201999;
Department of Urology Huashan Hospital Fudan University Shanghai 200000 China;
Dexmedetomidine; Radical prostatectomy; Prostatic cancer; Sedation and analgesia; Neurological function; Cerebral oxygen metabolism;