Blood and Fluid Management During Scoliosis Surgery

In patients of Group Protocol , basal crystalloid infusion was started at 4 ml/kg/h right after general anesthesia induction and intubation. ClearSight System (Edwards Lifesciences Cop, Irvine, CA, USA) was used to measure stroke volume variation and cardiac output, continuously and noninvasively through finger- cuffed technology. If SVV was \>15% rapid crystalloid bolus of 10ml/kg or 4ml/kg colloid bolus were administered until it reached a value of ≤15%. After two consecutive fluid boluses SVV remained \>15%, administration of noradrenaline infusion was considered.