Correlation of Carotid Intraplaque Hemorrhage and Stroke Using 1.5 T and 3 T MRI
Gerald S Treiman1, J Scott McNally2, Seong-Eun Kim2
1Utah Center for Advanced Imaging Research, Department of Radiology, University of Utah, Salt Lake City, Utah, USA ; Department of Surgery, VA Salt Lake City Health Care System, Salt Lake City, Utah, USA ; Department of Surgery, University of Utah, Salt Lake City, Utah, USA.
Insights
Carotid atherosclerosis causes many strokes, but current risk assessments are insufficient. Magnetic Resonance Imaging (MRI) can better assess plaque stability and composition, improving stroke risk prediction.
Area of Science:
- Neurology
- Radiology
- Vascular Medicine
Background:
- Carotid atherosclerotic disease is a significant cause of ischemic stroke, accounting for about 25% of strokes annually in the US.
- Current risk stratification methods based solely on percent stenosis lack specificity for individual stroke risk.
- Plaque instability and composition are critical factors in predicting stroke events, yet traditional methods cannot adequately assess these.
Purpose of the Study:
- To evaluate the utility of Magnetic Resonance Imaging (MRI) in characterizing carotid plaque components and morphology.
- To determine if MRI-based plaque analysis can improve stroke risk stratification compared to traditional methods.
- To investigate the correlation between MRI-detected carotid hemorrhage and acute stroke events.
Main Methods:
- Review of existing literature on carotid atherosclerosis, stroke risk, and imaging techniques.
- Analysis of retrospective studies examining plaque composition and stroke risk.
- Focus on the capabilities of Magnetic Resonance Imaging (MRI) for detailed plaque assessment.
Main Results:
- Percent stenosis measurements do not accurately predict stroke risk for most individuals.
- Carotid plaque instability and composition are strongly associated with cerebral ischemic events.
- Magnetic Resonance Imaging (MRI) is uniquely capable of identifying and measuring detailed plaque components and morphology.
- MRI can accurately detect carotid hemorrhage, which correlates with acute stroke.
Conclusions:
- Traditional methods for assessing carotid stenosis are inadequate for precise stroke risk stratification.
- Magnetic Resonance Imaging (MRI) offers superior capabilities for evaluating carotid plaque characteristics, including instability and composition.
- MRI-detected carotid hemorrhage is a significant indicator of acute stroke risk, suggesting its value in clinical decision-making.
Abstract:
Carotid therosclerotic disease causes approximately 25% of the nearly 690,000 ischemic strokes each year in the United States. Current risk stratification based on percent stenosis does not provide specific information on the actual risk of stroke for most individuals. Prospective randomized studies have found only 10 to 12% of asymptomatic patients will have a symptomatic stroke within 5 years. Measurements of percent stenosis do not determine plaque stability or composition. Reports have concluded that cerebral ischemic events associated with carotid plaque are intimately associated with plaque instability. Analysis of retrospective studies has found that plaque composition is important in risk stratification. Only MRI has the ability to identify and measure the detailed components and morphology of carotid plaque and provides more detailed information than other currently available techniques. MRI can accurately detect carotid hemorrhage, and MRI identified carotid hemorrhage correlates with acute stroke.
