Carotid plaque MRI and stroke risk: a systematic review and meta-analysis
Ajay Gupta1, Hediyeh Baradaran, Andrew D Schweitzer
1From the Departments of Radiology (A.G., H.B., A.D.S., P.C.S.), Neurology (H.K.), and Public Health (A.P., A.D., A.I.M., P.C.S.) and Samuel J. Wood Library & C.V. Starr Biomedical Information Center (D.D.), Weill Cornell Medical College, New York, NY.
Background And Purpose:
MRI characterization of carotid plaque has been studied recently as a potential tool to predict stroke caused by carotid atherosclerosis. We performed a systematic review and meta-analysis to summarize the association of MRI-determined intraplaque hemorrhage, lipid-rich necrotic core, and thinning/rupture of the fibrous cap with subsequent ischemic events.
Methods:
We performed a comprehensive literature search evaluating the association of carotid plaque composition on MRI with ischemic outcomes. We included cohort studies examining intraplaque hemorrhage, lipid-rich necrotic core, or thinning/rupture of the fibrous cap with mean follow-up of ≥1 month and an outcome measure of ipsilateral stroke or transient ischemic attack. A meta-analysis using a random-effects model with assessment of study heterogeneity and publication bias was performed.
Results:
Of the 3436 articles screened, 9 studies with a total of 779 subjects met eligibility for systematic review. The hazard ratios for intraplaque hemorrhage, lipid-rich necrotic core, and thinning/rupture of the fibrous cap as predictors of subsequent stroke/transient ischemic attack were 4.59 (95% confidence interval, 2.91-7.24), 3.00 (95% confidence interval, 1.51-5.95), and 5.93 (95% confidence interval, 2.65-13.20), respectively. No statistically significant heterogeneity or publication bias was present in the 3 main meta-analyses performed.
Conclusions:
The presence of intraplaque hemorrhage, lipid-rich necrotic core, and thinning/rupture of the fibrous cap on MRI of carotid plaque is associated with increased risk of future stroke or transient ischemic attack in patients with carotid atherosclerotic disease. Dedicated MRI of plaque composition offers stroke risk information beyond measurement of luminal stenosis in carotid atherosclerotic disease.
Insights
Magnetic Resonance Imaging (MRI) of carotid plaque can predict stroke risk. Key features like intraplaque hemorrhage and lipid-rich necrotic core significantly increase the likelihood of ischemic events.
Area of Science:
- Neuroimaging
- Cardiovascular Research
- Stroke Prevention
Background:
- Carotid atherosclerosis is a leading cause of stroke.
- MRI offers detailed characterization of carotid plaque composition.
- Plaque features may predict future ischemic events.
Purpose of the Study:
- To systematically review and meta-analyze MRI-determined carotid plaque features.
- To assess the association of intraplaque hemorrhage, lipid-rich necrotic core, and fibrous cap status with ischemic events.
Main Methods:
- Comprehensive literature search for cohort studies.
- Inclusion criteria: MRI plaque features, follow-up ≥1 month, ipsilateral stroke/TIA outcome.
- Meta-analysis using random-effects model with heterogeneity and bias assessment.
Main Results:
- 9 studies with 779 subjects were included.
- Hazard ratios for stroke/TIA: Intraplaque hemorrhage (4.59), Lipid-rich necrotic core (3.00), Thinning/rupture of fibrous cap (5.93).
- No significant heterogeneity or publication bias detected.
Conclusions:
- MRI-identified carotid plaque hemorrhage, necrotic core, and cap defects predict stroke/TIA risk.
- Carotid plaque MRI provides stroke risk information beyond luminal stenosis.
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