Prevalence of micro-emboli in symptomatic high grade carotid artery disease: a transcranial Doppler study.

Prevalence of micro-emboli in symptomatic high grade carotid artery disease: a transcranial Doppler study. Research Abstract Details 

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Prevalence of micro-emboli in symptomatic high grade carotid artery disease: a transcranial Doppler study. Abstract Text:

BACKGROUND AND PURPOSE: Echolucent carotid plaques, as well as downstream micro-embolisation, may be associated with an increased risk of stroke. However, the relationship between carotid plaque ultrasound characteristics and micro-embolic signals (MES) detected in the middle cerebral artery (MCA) is still controversial. The purpose of this study was to investigate the prevalence of MES in patients with symptomatic high-grade internal carotid artery (ICA) stenosis and to identify predisposing factors, such as plaque echogenicity and intra stenotic blood flow velocity pattern. METHODS: 197 patients (mean age 69.5+/-8.6, 161 males) with confirmed symptomatic high-grade ICA stenosis and anti-platelet treatment underwent bilateral MES monitoring for 30 minutes within the anterior circulation, using Power M-mode transcranial Doppler techniques (TCD). Carotid artery plaques were characterized by Gray-Weale scaling. RESULTS: In 32.0% of the patients, we detected MES by TCD within the MCA on the symptomatic side, but the same finding was made in only 4.5% on the corresponding asymptomatic site (p<0.0001). The presence or absence of MES was associated with neither ultrasonic plaque characteristics nor the intrastenotic blood flow velocities at peak systole and end diastole. The median time since the last ischemic event symptoms was shorter in the patient group with MES [+] than in MES [-] (p=0.013). CONCLUSIONS: Despite optimum standard anti-platelet therapy, cerebral micro-embolisation occurs in 30% of patients with symptomatic carotid artery disease, which might therefore be a possible risk factor for recurrent neurological symptoms. However, the presence of MES is independent of intrastenotic blood flow disturbances and grey scale ultrasound plaque characteristics. The presence of MES as an indicator of unstable plaque and thereby a possible risk factor for stroke should be evaluated prospectively using various algorithms for plaque classifications.

Prevalence of micro-emboli in symptomatic high grade carotid artery disease: a transcranial Doppler study. Publishing Authors By Initials

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Prevalence of micro-emboli in symptomatic high grade carotid artery disease: a transcranial Doppler study. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: European journal of vascular and endovascular surg

VOLUME: 35

Page Numbers: 534-40

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ISSN: 1532-2165

DAY: 4

MONTH: 03

YEAR: 2008

Prevalence of micro-emboli in symptomatic high grade carotid artery disease: a transcranial Doppler study. Information

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LANGUAGE: eng

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AFFILIATION: Department of Clinical Physiology, Sahlgrenska Academy, Göteborg; Neurology, Kaunas Medical University, Lithuania; Department of Neurology, Scarborough General Hospital, Scarborough, UK.

Country: England

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MEDLINETA: Eur J Vasc Endovasc Surg

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