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Influence of blood pressure and rheology on oscillatory shear index and wall shear stress in the carotid artery

Kumar, N., Pai, R., Abdul Khader, S. M. , Khan, S. ORCID: 0000-0001-5589-6914 & Kyriacou, P. A. ORCID: 0000-0002-2868-485X (2022). Influence of blood pressure and rheology on oscillatory shear index and wall shear stress in the carotid artery. Journal of the Brazilian Society of Mechanical Sciences and Engineering, 44(11), article number 510. doi: 10.1007/s40430-022-03792-5


Atherosclerosis is a localized complication dependent on both the rheology and the arterial response to blood pressure. Fluid–structure interaction (FSI) study can be effectively used to understand the local haemodynamics and study the development and progression of atherosclerosis. Although numerical investigations of atherosclerosis are well documented, research on the influence of blood pressure as a result of the response to physio–social factors like anxiety, mental stress, and exercise is scarce. In this work, a three-dimensional (3D) Fluid–Structure Interaction (FSI) study was carried out for normal and stenosed patient-specific carotid artery models. Haemodynamic parameters such as Wall Shear Stress (WSS) and Oscillatory Shear Index (OSI) are evaluated for normal and hypertension conditions. The Carreau–Yasuda blood viscosity model was used in the FSI simulations, and the results are compared with the Newtonian model. The results reveal that high blood pressure increases the peripheral resistance, thereby reducing the WSS. Higher OSI occurs in the region with high flow recirculation. Variation of WSS due to changes in blood pressure and blood viscosity is important in understanding the haemodynamics of carotid arteries. This study demonstrates the potential of FSI to understand the causes of atherosclerosis due to altered blood pressures.

Publication Type: Article
Additional Information: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit
Publisher Keywords: Atherosclerosis; High blood pressure; Oscillatory flow; Haemodynamics; Carreau-Yasuda model; Fluid Structure Interaction
Subjects: Q Science > QH Natural history > QH301 Biology
R Medicine > RZ Other systems of medicine
Departments: School of Science & Technology > Engineering
SWORD Depositor:
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