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Plaque components affect wall stress in stented human carotid artery: A numerical study
Authors:Zhen-Min Fan  Xiao Liu  Cheng-Fei Du  An-Qiang Sun  Nan Zhang  Zhan-Ming Fan  Yu-Bo Fan  Xiao-Yan Deng
Institution:1. School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China;2. Radiologic Department, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China
Abstract:Carotid artery stenting presents challenges of in-stent restenosis and late thrombosis, which are caused primarily by alterations in the mechanical environment of the artery after stent implantation. The present study con-structed patient-specific carotid arterial bifurcation models with lipid pools and calcified components based on magnetic resonance imaging. We numerically analyzed the effects of multicomponent plaques on the distributions of von Mises stresses (VMSs) in the patient-specific models after stenting. The results showed that when a stent was deployed, the large soft lipid pool in atherosclerotic plaques cushioned the host artery and reduced the stress within the arterial wall;how-ever, this resulted in a sharp increase of VMS in the fibrous cap. When compared with the lipid pool, the presence of the calcified components led to slightly increased stresses on the luminal surface. However, when a calcification was located close to the luminal surface of the host artery and the stenosis, the local VMS was elevated. Overall, compared with calcified components, large lipid pools severely dam-aged the host artery after stenting. Furthermore, damage due to the calcified component may depend on location.
Keywords:Atherosclerosis  Plaque composition  Carotid artery stenting  Restenosis  Finite-element analysis
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