Grade

Characteristic

I

Neurologically stable, no medical and angiographic risk with unilateral or bilateral ulcerative-stenotic carotid disease

II

Angiographic risk (contralateral ICA occlusion, high bifurcation, siphon stenosis, thrombus)

III

Medical risk (AP, IM within 6m, CHF, severe HTN, age >70) with or without angiographic risk

IV

Neurological risk (SE, resolved deficit <24h, recent CVA <7d, crescendo TIAs) with or without medical or /and angiographic risks