Key result
Decreasing fibrous cap thickness (ß = -0.91) and increasing lipid-rich necrotic core size significantly increased mechanical stress levels in carotid plaques, whereas the degree of stenosis had no significant overall effect.
Why the study?
Does carotid plaque morphology (fibrous cap thickness, LR-NC size, degree of stenosis) affect fibrous cap stress levels in computational models?
Does carotid plaque morphology (fibrous cap thickness, LR-NC size, degree of stenosis) affect fibrous cap stress levels in computational models?
Effect estimate: ß = -0.91 (95% CI -0.97 to -0.87)
p-value: p=<0.01
Computational modeling demonstrates that thin fibrous caps and large lipid-rich necrotic cores are the primary drivers of increased mechanical stress in carotid plaques, supporting their role as predictors of plaque vulnerability.
May refine imaging-based vulnerability assessment beyond stenosis; hypothesis-generating for human outcome studies.
Background and Purpose: Rupture of vulnerable carotid atherosclerotic plaques is a major cause of stroke. Stress levels may reflect risk of rupture in patients with carotid atherosclerotic plaques. Features thought to influence the risk of plaque rupture include the degree of stenosis, lipid-rich necrotic core (LR-NC) size, and thickness of the protective fibrous caps. We used computational models to investigate the effect of these variables on fibrous cap stress levels. Methods: Two-way coupled fluid-structure interaction longitudinal 2D simulations were performed on a bifurcation model based on idealized geometry derived from a symptomatic patient. Models with varying degrees of stenosis (50%-95%), fibrous cap thicknesses (0.05-1 mm), and LR-NC sizes (2 × 1 mm-6 × 3 mm) were simulated. The stress distribution for each model was calculated and peak principal stresses extracted. Regression analysis was used for assessing the relationship between the variables and stress levels. Results: Mechanical stresses increased with decreasing fibrous cap thicknesses ( β= -0.905, p Conclusions: Thin-capped plaques with large atheromas, known predictors of plaque vulnerability, were shown to exhibit the greatest mechanical stress levels.
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Thrysøe et al. (2012) studied Carotid atherosclerosis (n=1). Decreasing fibrous cap thickness and increasing lipid-rich necrotic core size vs. Thicker fibrous caps and smaller lipid-rich necrotic cores was evaluated on First principal stress levels in the fibrous cap (ß = -0.91, 95% CI -0.97 to -0.87, p=<0.01). Decreasing fibrous cap thickness (ß = -0.91) and increasing lipid-rich necrotic core size significantly increased mechanical stress levels in carotid plaques, whereas the degree of stenosis had no significant overall effect.
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