Review Article

A Critical Evaluation of Carotid Duplex Scanning in the Diagnosis of Significant Carotid Artery Occlusive Disease

Table 1

Duplex ultrasound criteria for internal carotid artery stenosis.

Stenosis categoryPSV, cm/sEDV, cm/s

<50%<135<40
50–69%135–284>40
70–99%>285>85
OcclusionNo flow detectedNo flow detected

PSV: peak systolic velocities; EDV: end diastolic velocities.