Optic Nerve Sheath Diameter in Pre-Eclamptic Parturient Receiving Magnesium Sulfate Combined With Dexmedetomidine

pre-eclamptic Patients will receive a loading dose of iv dexmedetomidine (0.5 ug/kg) diluted in 50 ml saline and given over 10 min, followed by a maintenance infusion of (0.2 ug/kg/h) diluted in 200 ml saline till The sedation scores on the Richmond Agitation and Sedation Scale was -2 to +1 (lightly sedated to restless).

pre-eclamptic patients will receive 50 ml saline loading for 10 min followed by 200 ml saline infusion