Flow and atherosclerosis in coronary bifurcations

Area of Science:

• Cardiovascular Medicine
• Biomedical Engineering
• Fluid Dynamics

Background:

• Coronary bifurcations are common sites for atherosclerosis.
• Complex hemodynamics and flow disturbances influence atheroma localization and progression.
• Endothelial shear stress (ESS) is a key flow-related factor in bifurcation atherosclerosis.

Purpose of the Study:

• To investigate the role of endothelial shear stress (ESS) in the distribution of atherosclerosis within coronary bifurcations.
• To understand how hemodynamic conditions and geometric factors influence plaque development at bifurcations.
• To identify areas prone to atherosclerosis and inform prevention strategies.

Main Methods:

• Analysis of hemodynamic conditions in coronary bifurcations.
• Correlation of endothelial shear stress (ESS) patterns with plaque prevalence.
• Evaluation of geometric factors (curvature, angles) and their impact on flow perturbations.

Main Results:

• Plaques are more prevalent in low ESS regions (lateral walls) and less common in high ESS areas (carina).
• The carina is affected in about one-third of cases, typically developing later via plaque expansion.
• Pulsatile flow and geometric factors like increased curvature and wide angles exacerbate flow disturbances and atherogenic environments.

Conclusions:

• Endothelial shear stress (ESS) and local flow disturbances are critical determinants of atherosclerosis localization in coronary bifurcations.
• Geometric configuration significantly influences flow patterns and plaque distribution.
• Further research into bifurcation hemodynamics is essential for improved prevention and management strategies.