Influence of stenosis on hemodynamic parameters in the realistic left coronary artery under hyperemic conditions

Area of Science:

• Cardiovascular physiology
• Biomedical engineering
• Medical imaging

Background:

• Coronary artery disease (CAD) diagnosis relies on anatomical stenosis, but functional significance is key.
• Hyperemic flow conditions are critical for evaluating stenosis severity and hemodynamic impact.
• 3D modeling and computational fluid dynamics (CFD) offer advanced insights into blood flow dynamics.

Purpose of the Study:

• To investigate the hemodynamic effects of hyperemic flow in 3D coronary artery models.
• To compare velocity, wall shear stress, and pressure drop in healthy versus stenotic arteries.
• To enhance understanding of how stenosis impacts blood flow under hyperemic conditions.

Main Methods:

• Reconstruction of 3D coronary artery models from patient CT scan data (healthy and CAD).
• Inclusion of >50% lumen area narrowing in diseased models.
• Simulation of hyperemic flow conditions using computational fluid dynamics (CFD).

Main Results:

• Recirculation zones identified immediately downstream of stenosis.
• Peak wall shear stress concentrated across the stenotic region.
• Significant pressure decrease observed downstream of stenosis compared to healthy arteries.

Conclusions:

• Hyperemic flow significantly alters hemodynamic parameters in stenotic coronary arteries.
• Wall shear stress distribution and pressure drop provide critical functional insights.
• CFD analysis of 3D models aids in understanding stenosis severity and cardiovascular risk.