Fig. 2

Receiver operating characteristics curves evaluating the ability of the variations in velocity time integral (%) and peak velocity of aortic blood flow (%) during a 12-sec end-expiratory occlusion maneuver to predict fluid responsiveness. ∆VTI-EEO, changes in velocity time integral (%) induced by end-expiratory occlusion. ∆Vmax, changes in peak velocity induced by end-expiratory occlusion. Responders, change in cardiac output ≥15% after volume expansion; non-responders, change in cardiac output <15% after volume expansion. Volume expansion, 500 mL saline 0.9% given over 15 minutes