Article Figures & Data
Figures
- Fig 1.
Graph shows distribution of ICAS according to angiographic interpretation.
- Fig 2.
Severe left ICAS in a 68-year-old woman.
A, CDU shows >70% ICAS with PSV of 347.5 cm/s, end diastolic velocity of 194.8 cm/s, and ICA to CCA ratio of 11.6.
B, 82% of ICAS is measured with BFI.
C, Digital subtraction angiography assesses 83% stenosis.
Tables
- Table 1:
Color duplex ultrasonography criteria for identification of 70% to 99% internal carotid artery stensosis
Parameters Criteria PSV ≥230 cm/s EDV ≥75 cm/s PSVICA/CCA ≥3.6 Note.—PSV indicates peak systolic velocity; EDV, end diastolic velocity; PSVICA/CCA, ratio of internal carotid artery to common carotid artery peak systolic velocity.
- 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 PSVICA/CCA ≥ 3.6 94 96 83 99 95 4.7 PSVICA/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; PSVICA/CCA, ratio of ICA to common carotid artery peak systolic velocity.
