Effect of Extended Lipid Core on the Hemodynamic Parameters: A Fluid-Structure Interaction Approach.

Area of Science:

• Cardiovascular Science
• Biomedical Engineering
• Fluid Dynamics

Background:

• Myocardial infarction (MI) is a leading cause of death globally.
• Coronary artery plaque rupture is the primary cause of MI.
• Understanding plaque vulnerability is crucial for preventing MI.

Purpose of the Study:

• To investigate the impact of lipid core extension into the artery wall on hemodynamic parameters.
• To analyze how altered flow fields affect coronary artery plaque vulnerability.
• To elucidate the relationship between lipid core size and rupture risk.

Main Methods:

• Utilized finite element method (FEM) for hemodynamic analysis.
• Incorporated fluid-structure interaction (FSI) to model blood flow and plaque behavior.
• Simulated non-Newtonian blood flow using the Carreau model.
• Employed four stenosis models with varying lipid core sizes and realistic coronary artery boundary conditions.

Main Results:

• Lipid core extension significantly alters the arterial flow field.
• Changes in flow patterns create conditions conducive to further lipid core development.
• Increased lipid core size correlates with heightened plaque vulnerability.

Conclusions:

• Lipid core extension into the artery wall is a critical factor in plaque progression.
• Altered hemodynamics resulting from lipid core growth increase the risk of plaque rupture.
• This research provides insights into the mechanisms underlying myocardial infarction.