The Effect of Pneumoperitoneum and Trendelenburg Position on Intracranial Pressure: Ultrasonographic Measurement of Optic Nerve Sheath Diameter

The steep Trendelenburg position and pneumoperitoneum during laparoscopic surgery have the potential to cause an increase of intracranial pressure (ICP). Previous studies have proposed that ultrasonographic measurements of the optic nerve sheath diameter (ONSD) correlate with signs of increased ICP. Therefore, this study is aim to confirm the increased ICP by ultrasonographic measurement of ONSD during laparoscopic surgery.

Inclusion Criteria:

• Adult patients (20-90 years of age) scheduled for undergoing robot-assisted laparoscopic prostatectomy undergoing general anesthesia

Exclusion Criteria:

• Patients with previous history of neurologic disease, carotid disease, transient ischemic attack, ocular disease and ocular surgery