Abstract
Shear stress of the blood at the vessel wall plays an important role in many processes in the cardiovascular system primarily focused on the regulation of vessel lumen and wall dimensions. There is ample evidence that atherosclerotic plaques are generated at low shear stress regions in the cardiovascular system, while high shear stress regions are protected. In the course of plaque progression, advanced plaques start to encroach into the lumen, and thereby start to experience high shear stress at the endothelium. Until now the consequences of high shear stress working at the endothelium of an advanced plaque are unknown. As high shear stress influences tissue regression, we hypothesised that high shear stress can destabilise the plaque by cap weakening leading to ulceration. We investigated this hypothesis in a magnetic resonance imaging (MRI) dataset of a 67-year-old woman with a plaque in the carotid artery at baseline and an ulcer at ten-month follow-up. The lumen, plaque components (lipid/necrotic core, intraplaque haemorrhage) and ulcer were reconstructed three dimensionally and the geometry at baseline was used for shear stress calculation using computational fluid dynamics. Correlation of the change in plaque composition...Continue Reading
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