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Table 1 Carotid artery stenosis definition and degree of severity

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