In anterior cervical disc surgery, head and neck extansion position and, surgical retraction used while reaching the anterior surface of the cervical vertebra can be affect the carotid blood flow and constituting a risk for cerebral ischaemia. In this study, we planned to investigate the relationship between head position and retraction, cerebral oxygenation and postoperative cognitive functions in patients undergoing anterior cervical disc surgery.

Inclusion Criteria:

• Aged 18-70 years
• Preoperative Mini-Mental State Examination score of 27-30
• Who were planned to undergo anterior cervical disc surgery under general anesthesia

Exclusion Criteria:

• Patients with hypertension, severe pulmonary disease, anaemia, cardiac disease, ischaemic cerebrovascular disease, renal disease, hepatic disease, pregnancy, uncontrolled diabetes mellitus, stricture or obstruction in the carotid or vertebral arteries or
• Body mass index (BMI) >30.

Patients undergoing cervical disc surgery