Stroke, Vol 22, 1485-1490, Copyright © 1991 by American Heart Association
JW Norris, CZ Zhu, NM Bornstein and BR Chambers
BACKGROUND AND PURPOSE: We sought to determine the risks of stroke,
myocardial ischemia, and vascular death in patients with asymptomatic
carotid stenosis. METHODS: Six hundred ninety-six patients with
asymptomatic carotid stenosis referred to the Doppler laboratory were
followed prospectively for a mean time of 41 months. These patients were
studied both clinically and by carotid Doppler ultrasound, including
evaluation of the effect of stroke risk factors. RESULTS: Transient
ischemic attacks occurred in 75 patients and stroke in 29, while 132 had
ischemic cardiac events. Five patients died from stroke and 59 from cardiac
causes. Annual stroke rate was 1.3% in patients with carotid stenosis less
than or equal to 75% and 3.3% in those with stenosis greater than 75%.
Ipsilateral stroke rate was 2.5% in patients with greater than 75% carotid
stenosis. Annual cardiac event rate was 8.3% and death rate 6.5% in
patients with severe carotid stenosis. CONCLUSIONS: With carotid stenosis
less than or equal to 75%, the stroke rate is negligible (1.3% annually)
whereas the combined risk of cardiac ischemia and vascular death is as high
as 9.9%. With stenosis greater than 75%, combined transient ischemic attack
and stroke rate is 10.5% per year, with 75% of events ipsilateral to the
stenosed artery.
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Vascular risks of asymptomatic carotid stenosis
Stroke Research Unit, Sunnybrook Health Science Centre, University of Toronto, Canada.
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