Effect of distal thickening and stiffening of plaque cap on arterial wall mechanics
| Autor: | Kyehan Rhee, Pengsrorn Chhai |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
0206 medical engineering Biomedical Engineering 02 engineering and technology 030204 cardiovascular system & hematology Stress (mechanics) 03 medical and health sciences 0302 clinical medicine Fluid–structure interaction Humans Arterial Pressure Computer Simulation Arterial wall Composite material Downstream Region Strain (chemistry) Coronary Stenosis Models Cardiovascular 020601 biomedical engineering Elasticity Plaque Atherosclerotic Computer Science Applications Stiffening Increased risk Stress Mechanical Thickening |
| Zdroj: | Medical & Biological Engineering & Computing. 56:2003-2013 |
| ISSN: | 1741-0444 0140-0118 |
| Popis: | To investigate the effect of longitudinal variations of cap thickness and tissue properties on wall stresses and strains along the atherosclerotic stenosis, stenotic plaque models (uniformly thick, distally thickened, homogenous, and distally stiffened) were constructed and subjected to computational stress analyses with due consideration of fluid-structure interactions (FSI). The analysis considered three different cap thicknesses-45, 65, and 200 μm-and tissue properties-soft, fibrous, and hard. The maximum peak cap stress (PCS) and strain were observed in the upstream throat section and demonstrated increases of the order of 345 and 190%, respectively, as the cap thickness was reduced from 200 to 45 μm in uniformly thick models. Distal stiffening increased PCS in the downstream region; however, the overall effect of this increase was rather small. Distal thickening did not affect maximum PCS and strain values for cap thicknesses exceeding 65 μm; however, a noticeable increase in maximum PCS and corresponding longitudinal variation (or spatial gradient) in stress was observed in the very thin (45-μm-thick) cap. It was, therefore, inferred that existence of a rather thin upstream cap demonstrating distal cap thickening indicates an increased risk of plaque progression and rupture. Graphical Abstract ᅟ. |
| Databáze: | OpenAIRE |
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