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A New Murine Model of Endovascular Aortic Aneurysm Repair
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Optimization schemes for endovascular repair with parallel technique based on hemodynamic analyses.

Huanming Xu1, Yuqian Mei2, Xiaofeng Han3

  • 1School of Life Science, Beijing Institute of Technology, Beijing, China.

International Journal for Numerical Methods in Biomedical Engineering
|March 7, 2019
PubMed
Summary

Endovascular repair using parallel stent-grafts (SG) can lead to fatal complications like occlusion. Optimizing SG placement and diameter through hemodynamic analysis is crucial for improving the long-term success of this challenging procedure.

Keywords:
hemodynamicoctopus endograft techniqueoptimization scenarios

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Area of Science:

  • Biomedical Engineering
  • Vascular Surgery
  • Medical Imaging

Background:

  • Endovascular repair with parallel stent-grafts (SG) reconstructs vessel lumen but faces challenges like SG occlusion and shifting.
  • These complications are often linked to adverse hemodynamic conditions within the stented region and can be life-threatening.

Purpose of the Study:

  • To investigate the hemodynamic factors contributing to limb stent-graft (SG) occlusion in a patient treated with the octopus endograft technique.
  • To propose optimization strategies for head-SG length and limb-SG diameter to improve flow distribution and reduce complications.

Main Methods:

  • Creation of 3-D computational models from CT angiography data (pre-treatment, post-treatment, and follow-up).
  • Quantitative analysis of hemodynamic parameters including pressure drop, wall shear stress, and flow division.
  • Simulation of various scenarios to optimize head-SG length and limb-SG diameter.

Main Results:

  • Limb-SG occlusion was observed in a patient treated with the octopus endograft technique.
  • Hemodynamic analysis identified high time-average wall shear stress (TAWSS) around the head-SG as a factor for graft migration.
  • Head-SG position/length and limb-SG diameter significantly influence flow distribution.

Conclusions:

  • Ensuring physiologically appropriate flow distribution is vital when using octopus stenting techniques.
  • Pre-treatment hemodynamic analysis and device selection/placement optimization can enhance the long-term effectiveness of complex endovascular repairs.