Correlation of carotid corrected flow time and respirophasic variation in blood flow peak velocity with stroke volume variation in elderly patients under general anaesthesia

Table 3 Diagnostic performance of carotid FTc and ΔVpeak to predict the ability of SVV ≥ 13%

Parameter	AUROC (95% CI)	P-value	Best Cut-off	grey zone	Patients in grey zone(%)	Sensitivity (%)	Specificity (%)	Youden index
FTc	0.811(0.721–0.900)	< 0.01	340.74	331.44–345.90	47.4	76.8	80.5	0.57
ΔVpeak	0.781(0.686–0.875)	< 0.01	11.69	9.97–13.42	48.5	78	67.9	0.48

AUROC Area under the receiver operating characteristic curve, FTc Carotid corrected flow time, ΔVpeak Respirophasic variation in carotid artery blood flow peak velocity

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