Optic Nerve Sheath Diameter for Volume Status Prediction in Severe Preeclampsia

Ocular ultrasonography was performed with the patients placed in supine position with closed eyes. A layer of ultrasound gel was applied over the closed upper eyelid and the liner high frequency probe 7 - 12 MHz of SonoSite M-Turbo ultrasound machine was placed on the temporal area of the eyelid with the hand holding it resting on the forehead of the patient. The probe is then adjusted to a suitable angle in order to display the entry of the optic nerve into the globe. ONSD is then measured 3mm behind the globe in the transverse plane perpendicular to the optic nerve. For each eye one measurement will be made and the reported ONSD corresponds to the mean of the two values obtained for each patient. it was performed for all enrolled parturients within 24 hour before delivery and at 24 hour post-delivery.