Sonography for determining the optic nerve sheath diameter with increasing intracranial pressure in a porcine model.

Objectives: This study investigated whether it is feasible to use sonography to monitor changes in the optic nerve sheath diameter in a porcine model.

Methods: A fiber-optic intracranial pressure transducer was surgically placed through the frontal sinus directly into the brain parenchyma of adult Yorkshire pigs (n = 5). A second bolt was placed on the contralateral side for intraparenchymal fluid infusion.