3. Informed consent and voluntary participation in the trial;
4. ASA class I-II;
5. Anticipated operation duration ≥ 2 hours;
6. No plan to ICU after operation.
You may not be if
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;
Clareo Health | Low-dose Neuroleptanalgesia for Postoperative Delirium in Elderly Patients
