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Coronary Artery Disease II: Pathophysiology01:26

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Coronary Artery Disease (CAD) originates from a series of events that impair the function of coronary arteries, the blood vessels responsible for delivering oxygen-rich blood to the heart muscle. The pathophysiology of CAD is closely linked to atherosclerosis, a chronic inflammatory and lipid-driven condition affecting the vascular endothelium.1. Endothelial DamageThe process begins with damage to the vascular endothelium, which serves as a protective barrier between the blood and the vessel...
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Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression
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Left coronary artery biomechanics: a characterization study using fluid structure interaction simulations.

Marina Fandaros1, Chloe Kwok1, Zachary Wolf1

  • 1Department of Biomedical Engineering, Stony Brook University, Bioengineering Building, Room 109, Stony Brook, NY, 11794, USA.

Biomechanics and Modeling in Mechanobiology
|June 12, 2025
PubMed
Summary

Patient-specific fluid-structure interaction (FSI) models were developed to assess coronary artery biomechanics and fractional flow reserve (FFR). Results showed good agreement with existing methods, offering improved physiological relevance for non-invasive assessment.

Keywords:
AtherosclerosisBiomechanicsCoronary arteryFluid–structure interaction (FSI)Virtual fractional flow reserve (vFFR)

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Area of Science:

  • Cardiovascular biomechanics
  • Computational fluid dynamics
  • Medical imaging analysis

Background:

  • Limited sample sizes hinder patient-specific coronary artery biomechanics research.
  • Current methods for assessing coronary artery function have limitations.

Purpose of the Study:

  • Develop patient-specific fluid-structure interaction (FSI) models for coronary arteries.
  • Characterize hemodynamic and biomechanical conditions within coronary arteries.
  • Compare FSI-derived fractional flow reserve (FFR) values with HeartFlow for clinical relevance.

Main Methods:

  • Utilized ten healthy left coronary artery (LCA) geometries.
  • Developed patient-specific FSI models using COMSOL Multiphysics.
  • Assessed hemodynamic and biomechanical parameters in the LAD artery.

Main Results:

  • All FSI models indicated healthy coronary artery perfusion.
  • Good agreement was observed between FSI-calculated and HeartFlow-derived FFR in the proximal LAD.
  • FSI models revealed variations in wall stress and strain along the LAD, remaining below rupture thresholds.

Conclusions:

  • Patient-specific FSI models offer enhanced physiological relevance for LCA simulations.
  • Biomechanical parameters showed minimal correlation with geometric features.
  • Further refinement of FSI modeling is needed for non-invasive coronary artery biomechanics assessment and clinical decision support.