A Comparison Between Propofol and Etomidate in Hysteroscopy on Effect of Postoperative Sedation and Cognitive Function in Elderly Patients

To compare the effect of propofol and etomidate in hysteroscopy on postoperative sedation and cognitive function in elderly patients

Inclusion Criteria:

1. Aged between 60 and 80 years
2. Selective hysteroscopic operation
3. American Society of Anesthesiology (ASA) Physical Status: Ⅰ or Ⅱ
4. Signed informed consent form
5. Expected operation duration is within 60 minutes

Exclusion Criteria:

1. Serious cardiac, cerebral, liver, kidney, lung, endocrine disease or sepsis
2. Long use of hormone or history of adrenal suppression
3. Allergy to trial drug or other contraindication
4. History or expected difficult airway
5. Identified, suspected abuse or long use of narcotic analgesia
6. Neuromuscular diseases
7. Mentally unstable or has a mental illness
8. Dysfunction of communication
9. Trend of malignant hyperthermia
10. Pregnant or breast-feeding women
11. Attended other trial past 30 days;