Optic Nerve Sheath Diameter for Volume Status Prediction in Severe Preeclampsia

A quick, non-invasive, bedside test to assess fluid status of patients with severe preeclampsia would be very helpful to ICU clinicians severe preeclampsia is associated with an increase in extravascular lung water (EVLW), which can be identified by lung ultrasound before appearance of clinical signs of pulmonary edema but this technique still requires several measurements and could be time consuming. Optic ultrasound is also a safe and repeatable diagnostic tool, which is even quicker and simpler to perform than lung ultrasound. Increased ONSD is associated with increased ICP and it can indirectly reflect the state of intracranial edema that could be a part of generalized edema. More data on the correlation between ONSD and markers of fluid status (EVLW by ultrasound) are needed before ONSD measurements can be recommended as a guide to fluid management in preeclampsia.