Fig. 3.
Receiver operating characteristics curves generated for ΔSVI 50 (changes in stroke volume index [SVI] induced by a rapid 50 ml volume expansion), ΔSVI 100 (changes in stroke volume index induced by a rapid 100 ml volume expansion), and pulse pressure variations (PPV) showing the ability to predict the effect of a 250 ml volume expansion given over 10 min. Positive fluid challenge was defined as an increase in stroke volume index of 10% or greater from baseline after an infusion of 250 ml.