THe Comparison of Target Controlled Infusion of Propofol or Etomidate at General Anesthesia in Geriatric Patients

Exclusion Criteria

• •1. Body mass index is more than 36kg/m2.
• •2. Systolic blood pressure≥180 mm Hg or \<90 mm Hg，diastolic blood pressure≥110 mm Hg or \< 60 mm Hg.
• •3. Serious cardiac,cerebral,liver,kidney,lung, endocrine disease or sepsis.
• •4. Long term used hormone or adrenal suppression.
• •5. Allergy to trial drug or other contraindication.
• •6. Difficult airway occurred before,or difficult airway possibly occurred and difficult to extubation.
• •7. Abuse of narcotic analgesia or suspected.
• •8. Neuromuscular diseases.
• •9. Mentally unstable or has a mental illness.
• •10. Malignant Hyperthermia.
• •11. Pregnant or breast-feeding women.
• •12. Attended other trial past 30 days. -