Table 5.

Prediction of fluid responsiveness by receiver operating characteristic curves of pulse pressure variation and pleth variability index

	AUROC curve (95% CI)	P-value	Cut-off value	Gray zone	Patients in the gray zone (%)	Sensitivity (%) (95% CI)	Specificity (%) (95% CI)
Supine
PPV	0.783 (0.648–0.884)	<0.001	10%	8.2%–13.9%	18 (34)	75.0 (58.8–87.3)	61.5 (31.6–86.1)
PVI	0.814 (0.684–0.908)	<0.001	8%	6.0%–11.4%	23 (43)	77.5 (61.5–89.2)	76.9 (46.2–95.0)
Prone
PPV	0.781 (0.646–0.883)	<0.001	7%	6.4%–10.4%	31 (58)	81.5 (61.9–93.7)	61.5 (40.6–79.8)
PVI	0.756 (0.618–0.863)	<0.001	8%	6.5%–10.7%	31 (58)	66.7 (46.0–83.5)	69.2 (48.2–85.7)

Abbreviations: AUROC, area under the receiver operating characteristic; PPV, pulse pressure variation; PVI, pleth variability index.