Cancer
Conditions
Interventions
Sponsors
Eligibility
Inclusion criteria
Inclusion criteria: Aged 18-65 years, ASA I-II, elective abdominal surgery.
Exclusion criteria
Exclusion criteria: 1. Anemia, hemoglobin 30kg/m^2; 3. Sinus delay (HR<50bpm) or high heart block (II degree type 2 or III degree), cardiac insufficiency, LVEF<50%; 4. Liver and kidney dysfunction, systemic or vital organ infection, long-term use of a receptor blocking drugs for blood pressure, long-term use of psychotropic drugs, antiepileptic drugs or analgesics; 5. Conversion to open surgery, or excessive intraoperative bleeding and the need for blood transfusion; 6. Drinking alcohol; 7. Have a history of allergy to anesthetic drugs used in this study.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| The ED50 of dexmedetomidine for maintainance of genaral anesthesia; | — |
Secondary
| Measure | Time frame |
|---|---|
| Intraoperative awareness;Perioperative mini-mental state examination (MMSE) score; | — |
Countries
China