Monitoring Hypertensive Patients's Cerebral Oxygen Saturation "MHPCOS"

Completed

Phase N/A Results N/A

Eligibility Criteria

Inclusion Criteria

- patients have hypertension more than 3 year,whether well-controlled or uncontrolled,
- scheduled for major abdominal surgery for at least 2 h
- under general anesthesia
- American Society of Anesthesiologists(ASA)physical status : II ~ III
- Age > 30

Exclusion Criteria

- pre-existing cerebral pathology for example episodes of cerebral ischemia or stroke;
- ASA physical status >IV
- hepatic failure
- renal failure
- preoperative Mini-Mental State Examination (MMSE) score less than 24
- a history of cardiovascular surgery or craniotomy
- cardiac failure
- respiratory failure