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Table 2: Diagnostic performance color duplex ultrasonography, B-flow imaging, and a combination of these tests in detecting 70% of 99% internal carotid artery stensosis
Criteria Sens (%) Spec (%) PPV (%) NPV (%) ACC (%) MRate (%)
BFI ≥ 70% 65 98 91 92 92 8.1
PSV ≥ 230 cm/s 91 93 74 98 92 7.6
PSV ≥ 230 cm/s + BFI ≥ 70% 90 98 90 98 97 2.8
EDV ≥ 75 cm/s 91 95 81 98 94 5.8
EDV ≥ 75 cm/s + BFI ≥ 70% 95 99 95 99 99 1.4
PSV_ICA/CCA ≥ 3.6 94 96 83 99 95 4.7
PSV_ICA/CCA ≥ 3.6 + BFI ≥ 70% 95 99 95 99 99 1.4
Note.—Sens indicates sensitivity; Spec, specificity; PPV, positive predictive value; NPV, negative predictive value; Acc, accuracy; MRate, misclassification rate; BFI, B-flow imaging; PSV, peak systolic velocity; EDV, end diastolic velocity; PSV_ICA/CCA, ratio of ICA to common carotid artery peak systolic velocity.