Oscillometric pulse wave analysis for detecting low flow arteriovenous fistula

BMC Nephrology

Table 3 Testing for low flow fistulas: ROC-Analysis

Parameter	AUC	p	Lower Bound	Upper Bound	maximal Youden's-Index	corresponding cut-off	Sensitivity	Specificity	Positive predictive value	Negative predictive value
Slope2_Fi	0,652	0,167	0,437	0,866	0,35	0,000026	0,8	0,56	0,27	0,93
∆Slope2	0,624	0,253	0,411	0,836	0,28	0,002744	0,73	0,44	0,21	0,89
Slope∑_Fi	0,732	0,006	0,566	0,899	0,42	0,009639	0,86	0,56	0,29	0,95
∆Slope∑	0,662	0,163	0,434	0,889	0,32	0,000782	0,61	0,78	0,36	0,91
AMP_Fi	0,775	0,012	0,56	0,991	0,64	1138	0,86	0,78	0,44	0,96
∆AMP	0,823	0,002	0,622	1,024	0,71	416	0,93	0,78	0,46	0,98

For discription of variables see method section of the main document, ROC receiver operator curve, presented by AUC and confidence interval bounds with p-value, n = 53: Values of measurements at the fistula arm (Slope2_Fi, Slope∑_Fi and AMP_Fi) as well as differences of measurements at the fistula and non-fistula arm (∆Slope2, ∆Slope∑ and ∆AMP) were analysed. A low flow fistula was defined by duplex measurements of flow < 500 ml/min at the fistula arm

ISSN: 1471-2369