From: Contemporary incidence and risk factors for carotid artery disease in patients referred for coronary artery bypass surgery
Duplex US Measurement
Mild <50%
Moderate 50-69%
Severe 70-99%
PSVICA (mm/sec)
<125
125-229
>230
PSVICA/PSVCCA
<2
2.0-3.9
>4.0