Inferior Vena Cava Collapsibility Index Guide for Preoperative Fluid Therapy in Preeclampsia

"300 ml by dripping within 30 minutes, the fluid will be repeated by half the amount if needed to reach equal or less than 50% collapsibility.~the fluid that will be used is sterile Ringer's solution which is an isotonic intravenous solution with pH 5.0 - 7.5 and an osmolality of 308mOsmol/kg."