STimulation Electronically of Acupoints for Postoperative Delirium in elderlY Patients

Exclusion Criteria

• •1. Patients with severe central nervous system injury or severe cerebrovascular disease
• •2. Patients with cognitive dysfunction assessed by Confusion Assessment Method before surgery
• •3. Patients unable to cooperate with studies, such as psychiatric disorders or difficulty in communication
• •4. Patients with severe hepatic and renal insufficiency
• •5. Patients with severe respiratory diseases
• •6. Patients with contraindication for transcutaneous electrical stimulation, such as implanted electrophysiological devices, skin infection and damage at acupuncture points
• •7. Anticipated duration of anesthesia shorter than 2 hours or postoperative hospital stay shorter than 3 days