Effects of Sevoflurane and Propofol on Light Flash Evoked Pupillometry

Measurement of Pupil Diameter

Pupillometry, Sevoflorane, Propofol

Null hypothesis (HO): There will be no difference in pupillometry readings when using any of the maintenance anesthetic techniques within subjects. Alternate hypothesis (HA): Pupillometry readings will be affected by a change in the anesthetic technique

Postoperative visual loss resulting from a surgical procedure not performed on the eye is a devastating outcome for the patient and poorly understood by the medical community. It is potentially a preventable complication. Diminished blood supply to the optic nerve, affecting both the anterior or posterior portions of the optic nerve, is the most common cause of postoperative visual loss. Other, less common causes include occlusion of the retinal artery and vein, a retinal embolism and cortical blindness. The incidence of postoperative visual loss increases in patients undergoing cardiopulmonary bypass and prone spine surgery. Although the etiology of post-operative visual loss is unknown, it is thought to be multifactorial, and several potential risk factors have been identified, including degree of low blood pressure, preoperative hematocrit, external compression of the eye, amount of blood loss, prolonged duration of surgical time and increased pressure in the eye associated with positioning. To date studies have focused on the mechanism associated with the visual loss. We would like to focus on the feasibility of using a monitor which may signal loss of visual function intraoperatively.

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