Key result
The non-Newtonian Carreau-Yasuda model demonstrated significant spatial variations in Wall Shear Stress compared to the Newtonian model, which undervalued WSS in regions of flow recirculation and stenosis.
Why the study?
The effect of blood rheology on hemodynamic parameters such as wall shear stress and vorticity in the human carotid artery requires investigation.
Answers are grounded in this paper and cite their sources.
Computational fluid dynamics modeling demonstrates that incorporating non-Newtonian blood rheology is important for accurately estimating wall shear stress in carotid arteries, especially near plaques and bifurcations.
Pulsatile blood flow through the human carotid artery is studied using Computational Fluid Dynamics (CFD) to investigate the effect of blood rheology on the hemodynamic parameters. The carotid artery model used is segmented and reconstructed from the Magnetic Resonance Images (MRI) of a specific patient. The results of a non-Newtonian (Carreau-Yasuda) model and a Newtonian model are studied and compared. The results are represented for each peak systole where it is observed that there is significant variation in the spatial parameters between the two models considered in the study. Comparison of local shear stress magnitude in different branches namely Common Carotid Artery (CCA), Internal Carotid Artery (ICA) and External Carotid Artery (ECA) show that the shear thinning property of blood influences the Wall Shear Stress (WSS) variation. This is observed in branches where there is reduction in diameter and where the diameter reduces due to plaque deposition and also in the region where there is flow recirculation like carotid sinus
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Nitesh Kumar (2021) studied Carotid artery stenosis and hemodynamics (n=1). Non-Newtonian (Carreau-Yasuda) blood viscosity model vs. Newtonian blood viscosity model was evaluated on Wall Shear Stress (WSS) and vorticity. The non-Newtonian Carreau-Yasuda model demonstrated significant spatial variations in Wall Shear Stress compared to the Newtonian model, which undervalued WSS in regions of flow recirculation and stenosis.
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