Effect of electroacupuncture stimulation on postoperative cognitive dysfunction in patients undergoing knee and hip arthroplasty: a randomized double-blind trial

INTERVENTION: Electroacupuncture group:Electroacupuncture;Dexmedetomidine group:Dexmedetomidine;Electroacupuncture combined with dexmedetomidine group:Electroacupuncture combined with dexmedetomidine ; CONDITION: Postoperative cognitive dysfunction PRIMARY OUTCOME: Mini‐mental State Examination; SECONDARY OUTCOME: Intraoperative sedative and analgesic drug dosage;Hospital Anxiety and Depression Scale;s‐100ß protein; INCLUSION CRITERIA: INCLUSION CRITERIA: 1. patients scheduled for knee or hip arthroplasty at Jiaxing First Hospital; 2. ASA classification = grade III; 3. those who could cooperate with the neuropsychological assessment; 4. those who had signed the informed consent; 5. age = 45 years;