Fig. 3. . Receiver operating characteristics curves representing the discriminative power of volume expansion–induced changes in arterial pressure to detect an increase of more than 15% of cardiac output after volume expansion. Receiver operating characteristics curves representing the discriminative power of volume expansion–induced percent changes in SAP (A ), DAP (B ), MAP (C ), and PP (D ) to detect an increase of more than 15% of cardiac output after volume expansion. AUC = area under the curve; DAP = diastolic arterial pressure; MAP = mean arterial pressure; PP = pulse pressure; SAP = systolic arterial pressure.