Abstract:
BACKGROUND AND PURPOSE:Previous work has shown that cerebral microembolism detected with transcranial Doppler sonography distal to internal carotid artery stenosis occurs more frequently in recently symptomatic compared with asymptomatic patients. It has remained unclear whether cerebral microembolism also indicates a higher risk of future cerebral or retinal ischemia. SUMMARY OF REPORT:Sixty-four asymptomatic patients with unilateral 70% to 90% internal carotid artery stenosis were investigated prospectively (mean follow-up, 72 weeks). Five patients developed ischemic symptoms attributable to the stenosis (transient ischemic attack, 2 patients; stroke, 3 patients). A microembolic rate of > or = 2 per hour in the ipsilateral middle cerebral artery was associated with a substantially increased risk of developing ischemia of the corresponding carotid territory (odds ratio, 31; 95% confidence interval, 3 to 302; P = .005). CONCLUSIONS:This prospective pilot study suggests that cerebral microembolism detected with transcranial Doppler sonography may define a high-risk subgroup among patients with asymptomatic high-grade internal carotid artery stenosis.
journal_name
Strokejournal_title
Strokeauthors
Siebler M,Nachtmann A,Sitzer M,Rose G,Kleinschmidt A,Rademacher J,Steinmetz Hdoi
10.1161/01.str.26.11.2184subject
Has Abstractpub_date
1995-11-01 00:00:00pages
2184-6issue
11eissn
0039-2499issn
1524-4628journal_volume
26pub_type
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