Fluid-structure interaction analysis of the left coronary artery with variable angulation.

Area of Science:

• Cardiovascular biomechanics
• Medical imaging and modeling
• Fluid-structure interaction (FSI)

Background:

• Coronary artery disease (CAD) is a leading cause of mortality.
• Bifurcation geometry is implicated in the initiation of atherosclerotic plaques.
• Understanding the interplay of mechanical forces and arterial geometry is critical for CAD research.

Purpose of the Study:

• To investigate the correlation between coronary artery branch angulation and local mechanical/hemodynamic forces.
• To analyze the influence of varying branch angles on stress distribution and wall shear stress.
• To demonstrate the medical application potential of fluid-structure interaction (FSI) modeling in coronary arteries.

Main Methods:

• Development of five idealized left coronary artery models with angles from 70° to 110°.
• Utilized a coupled fluid-structure interaction (FSI) modeling approach.
• Reconstruction of a coronary artery model based on CT imaging for clinical relevance.

Main Results:

• Coronary artery angulation significantly alters mechanical stress distribution.
• Arterial wall compliance substantially moderates instantaneous wall shear stress.
• Wider angles (e.g., left circumflex side bifurcation) showed a higher tendency for atherosclerotic changes due to increased tensile stress.

Conclusions:

• Branch angulation is a critical factor influencing biomechanical forces within coronary arteries.
• FSI modeling provides valuable insights into the mechanisms of atherosclerosis initiation at bifurcations.
• Findings suggest that specific angulations may predispose individuals to atherosclerotic development, particularly at the left circumflex bifurcation.