Effect of Tourniquet Application on Optic Nerve Sheath Diameter

The Effect of Tourniquet Application on Optic Nerve Sheath Diameter and Cerebral Oxygenation During Lower Extremity Surgery

The aim of the study to investigate the effect of tourniquet application on optic nerve sheath diameter (ONSD) and cerebral oxygenation during lower extremity surgery.

Inclusion Criteria:

• ASA I-II risk group over the age of 18
• Operation planned under general anesthesia
• Lower extremity surgery with a tourniquet
• Agreeing to volunteer for research with an informed consent form

Exclusion Criteria:

• Emergency surgical procedures
• neurological disease, carotid disease
• Previous intracranial or ocular surgery
• Neurological symptoms
• cerebral edema, high IntraCranial Pressure
• Presence of glaucoma
• Body mass index (BMI)> 35
• Uncontrolled hypertension
• Diabetic retinopathy
• anemia
• coronary artery disease
• peripheral artery disease