Table 1:

Color duplex ultrasonography criteria for identification of 70% to 99% internal carotid artery stensosis

ParametersCriteria
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.