Low-dose Neuroleptanalgesia for Postoperative Delirium in Elderly Patients

Exclusion Criteria

• •1. Neurosurgery;
• •2. Patients with neurological and mental diseases: such as basal ganglia disease, Parkinson's syndrome, severe central nervous depression, Alzheimer's disease , etc;
• •3. Patients with prolonged Q-T interval, cardiac repolarization disorder and other severe arrhythmia;
• •4. Patients with severe cardiopulmonary disease, liver and kidney dysfunction;
• •5. Allergic or contraindications to droperidol or fentanyl citrate;
• •6. Admitted to ICU after operation.
• •7. Operation duration \< 2 hours;