Measurement of the Cerebral Saturation for Assessment of Safety of Epidural Anaesthesia During Abdominal Surgery

Measurement of the Cerebral Saturation for Assessment of Safety of Epidural Anaesthesia During Abdominal Surgery

Subsequent and non-randomised patients, adult patients qualified for major abdominal surgeries were enrolled

Inclusion Criteria:

• scheduled for major abdominal surgery for at least 2 h
• under general anesthesia
• American Society of Anesthesiologists（ASA）physical status : II ~ III
• Age > 18

Exclusion Criteria:

• refuse of patients
• patient with results of test: "The Mini Mental State Examination"" less then 24 before operation
• neurosurgery history of patients