Fig. 4. The distribution of infused fluid after 150 min of thyroid surgery during isoflurane or propofol anesthesia for all patients (top), in those without horizontal elimination curves (middle), and in the patients who were  not given ephedrine (bottom). 3rd = extravascular fluid retention (“third spacing”); Evap = sum of estimated evaporation and bled plasma;  v ¹= central body fluid space;  v ²= peripheral body fluid space.