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Local hemodynamic analysis after coronary stent implantation based on Euler-Lagrange method.

Yuchen Wang1, Jingmei Zhan2, Weiguo Bian3

  • 1Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi'an Jiaotong University, Xi'an, 710049, Shaanxi, China.

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|May 28, 2021
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A new non-Newtonian model simulates blood flow in stented arteries, revealing how stent design impacts restenosis risk. Optimizing stent struts can reduce complications like flow stagnation and red blood cell deposition.

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Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Cardiovascular Research

Background:

  • Coronary artery disease (CAD) is treated with stents, but in-stent restenosis (ISR) remains a significant risk.
  • Stent implantation alters local hemodynamics, influencing blood flow patterns and potentially leading to complications.
  • Understanding blood flow dynamics within stented arteries is crucial for improving stent design and patient outcomes.

Purpose of the Study:

  • To develop and validate a non-Newtonian particle suspension model for simulating realistic blood flow in stented arteries.
  • To investigate the hemodynamic changes induced by coronary stent implantation.
  • To identify specific stent regions associated with a higher risk of ISR.

Main Methods:

  • A novel non-Newtonian particle suspension model was developed, treating red blood cells (RBCs) as rigid particles and blood as a suspension.
  • The model incorporated blood's non-Newtonian characteristics, cell-cell interactions, and RBC shape/rotation effects.
  • The proposed model was compared against four other common hemodynamic models, and simulations of stented arteries were performed.

Main Results:

  • The non-Newtonian characteristic is essential for accurately describing blood flow in stented arteries.
  • Stent struts cause flow stagnation zones and uneven pressure gradients.
  • Low wall shear stress (WSS < 0.5 Pa) regions were observed near struts, with larger low-WSS zones behind front struts.

Conclusions:

  • Stent implantation significantly alters local hemodynamics, creating conditions conducive to ISR.
  • Regions near proximal and distal stent struts are particularly vulnerable to RBC stagnation, erosion, and deposition.
  • Optimizing stent strut design in these vulnerable areas is recommended to reduce ISR risk.