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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