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Acute stress concentration plays an important role in plaque rupture and may cause stroke or myocardial infarction. Quantitative evaluation of the relation between in vivo plaque stress and variations in blood pressure and flow rates is valuable to optimize daily monitoring of the cardiovascular system for high-risk patients as well as to set a safe physical exercise intensity for better quality of life. In this study, we constructed an in vivo stress model for a human carotid bifurcation with atherosclerotic plaque, and analyzed the effects of blood pressure, flow rates, plaque stiffness, and stenosis on the elastic stress and fluid viscous stress around the plaque. According to the maximum values of the mechanical stress, we define a risk index to predict the risk level of plaque rupture under different exercise intensities. For a carotid bifurcation where the blood flow divides, the results suggest that the stenosis ratio determines the ratio of the contributions of elastic shear stress and viscous shear stress to plaque rupture. An increase of the plaque stiffness enhances the maximum elastic shear stress in the plaque, indicating that a high-stiffness plaque is more prone to rupture for given stenosis ratio. High stress co-localization at the shoulder of plaques agrees with the region of plaque injury in clinical observations. It is demonstrated that, due to the stress-shield effect, the rupture risk of a high-stiffness plaque tends to decrease under high-stenosis conditions, suggesting the existence of a specific stenosis corresponding to the maximum risk. This study may help to complement risk stratification of vulnerable plaques in clinical practice and provides a stenosis mechanical property-specific guide for blood pressure control in cardiovascular health management.
Acta Mechanica Sinica – Springer Journals
Published: Jun 27, 2019
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