Fig. 2.

Receiver operating characteristic (ROC) and (AUC) curves for predicting the ability of changes in heart rate (HR), central venous pressure (CVP), stroke volume (SV), mean arterial blood pressure (MABP), pulmonary artery pressure (PAP), right atrial pressure (RAP), stroke volume variation (SVV), pulse pressure variation (PPV) and pulmonary capillary wedge pressure (PCWP) to detect fluid responsiveness. The straight line indicates the line of identity. AUC=0.5 predicts that fluid responsiveness is equal to chance. AUC=1.0 indicates that SV ≥15% increases with fluid loading. SVV, PPV, CVP and PAP provided the best predictions. HR and MABP failed to predict fluid responsiveness.