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Are spontaneous cerebral microemboli consistent in carotid disease?
Suzanne Hutchinson1, Graham Riding, Stuart Coull
1Vascular Studies Unit, South Manchester University Hospital, Wythen-Shawe, Manchester, UK.
Stroke
|March 2, 2002
Summary
Spontaneous cerebral emboli (SCE) detection via Transcranial Doppler is inconsistent in patients with symptomatic carotid disease. Monitoring is lengthy, making SCE unreliable for identifying at-risk individuals.
Area of Science:
- Neurology
- Vascular Surgery
- Diagnostic Imaging
Background:
- Transcranial Doppler (TCD) is explored for detecting spontaneous cerebral emboli (SCE).
- Consistent identification of SCE is crucial for identifying patients at risk of stroke.
- The study focuses on the consistency of SCE production in patients with symptomatic carotid disease.
Purpose of the Study:
- To investigate the consistency of spontaneous cerebral emboli (SCE) production over time.
- To determine if Transcranial Doppler (TCD) can reliably identify patients with symptomatic carotid disease at risk.
Main Methods:
- 25 patients with >70% symptomatic carotid stenosis underwent TCD monitoring.
- Middle cerebral artery signals were recorded for 1 hour, repeated weekly for 6 weeks.
- Blind analysis by trained observers assessed SCE presence.
Main Results:
- 52% of patients eventually showed SCE, but detection was inconsistent.
- 40% were positive in only one session, 8% in two sessions.
- SCE positivity showed weak, non-significant correlation with recent symptoms.
Conclusions:
- SCE production is random, requiring extensive monitoring for confirmation.
- SCE detection is unlikely to reliably identify at-risk patients.
- SCE may indicate transiently increased risk in individual patients with severe carotid disease.