Table 181 Stroke risk with surgery or medical management

Degree

Study Stenosis Follow-Up CEA Medical

Symptomatic

North American Symptomatic > 70% 2 years 9% 26%

Carotid Endarterectomy Trial (NASCET) stroke rate at 2 years

North American Symptomatic 50-70% 5 years 15% 22%

Carotid Endarterectomy Trial

(NASCET) stroke rate at 5 years

Asymptomatic

Asymptomatic Carotid > 60% 5 years 5% 11%

Atherosclerosis Study (ACAS)

suggesting that there is a poor correlation with the degree of stenosis in the symptomatic patient. Current recommendations are duplex scanning and angiography if post-stenosis velocities do not return to normal.

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