EEG Characteristics of Different Sedation Depths in Neurosurgery Patients

Exclusion Criteria

• •1. Obese patients, BMI\>30kg/m2;
• •2. Patients with Mallampati class III to IV airway anatomy;
• •3. Combined with other neurological or psychiatric diseases;
• •4. Combined with disturbance of consciousness;
• •5. Previous intracranial surgery;
• •6. Known or suspected cardiac dysfunction;
• •7. Allergic to intravenous general anesthetics;
• •8. Long-term history of analgesia, sedation and drug abuse.