Fig. 3

Conditional values of the area under the receiver operating characteristic curve (AUC) generated to test the ability changes in Analgesia Nociceptive Index (ANI) to detect an increase in stroke volume ≥ 10% following a volume expansion of 250 mL saline 0.9% according to. a Mean Analgesia Nociceptive Index (ANIm) before volume expansion. b Remifentanil dose regimen (ng.ml⁻¹). c Propofol dose regimen (mcg.ml⁻¹). Continuous lines show the mean area under the receiver operating characteristics curve and dotted lines show the 95% confidence interval. The area under the curve, which reflects diagnostic ability, appears to be influenced by the dose of remifentanil and the ANI value. High remifentanil dose and high ANIm value seem to be associated with lower diagnostic abilities