The peripheral perfusion index and transcutaneous oxygen challenge test are predictive of mortality in septic patients after resuscitation

Table 5 Comparison of the areas under the ROC curves for predicting ICU mortality in the septic patients.

	ROC area	95% CI	Cutoff value	Sensitivity (%)	Specificity (%)
Lactate	0.80	0.658-0.905	4.2	45	84.62
Pv-a CO₂	0.62^a	0.469-0.762	7	40	88.46
PI	0.84	0.698-0.929	0.2	65	92.3
ScvO₂	0.62^a	0.468-0.762	0.67	55	73.08
PtcO₂	0.66^b	0.508-0.795	61	55	80.8
PtcO₂ index	0.54^c	0.387-0.688	0.51	30	76.92
10min-OCT	0.81	0.662-0.907	66	65	96.2
OCI	0.74	0.588-0.857	0.55	60	88.5

^aP < 0.05 for comparison of Pv-a CO₂, ScvO₂vs, PI; ^bP <0.05 for comparison of PtcO₂ vs. PI, lactate; ^cP <0.05 for comparison of PtcO₂ index vs. 10min-OCT, OCI, PI and lactate. ROC, receiver operating characteristic; CI confidence interval; Pv-a CO₂ , difference between central venous and arterial PCO₂ (mmHg); PI, peripheral perfusion index measured by pulse oximetry; ScvO₂, central venous oxygen saturation; 10min-OCT, 10 minute oxygen challenge test value (mmHg); OCI, oxygen challenge index.

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