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The Impact of the Right Coronary Artery Geometric Parameters on Hemodynamic Performance
N Pinho1, L C Sousa2,1, C F Castro2,1
1Institute of Science and Innovation in Mechanical and Industrial Engineering (LAETA-INEGI), Rua Dr. Roberto Frias, 400, 4200-465, Porto, Portugal.
Insights
Coronary artery geometry significantly impacts blood flow and atherosclerosis risk. Specific geometric features of the right-ventricular branch strongly correlate with hemodynamic factors linked to plaque formation.
Area of Science:
- Cardiovascular physiology
- Biomedical engineering
- Medical imaging analysis
Background:
- Coronary artery geometry influences blood flow dynamics.
- Geometric variations can promote atherosclerotic plaque formation.
- Understanding these relationships is crucial for predicting cardiovascular disease risk.
Purpose of the Study:
- To statistically analyze the relationship between right coronary artery geometric parameters and hemodynamic descriptors.
- To investigate how factors like ostium area, angles, tortuosity, and branch cross-sectional areas affect blood flow.
- To identify geometric features associated with hemodynamic conditions conducive to atherosclerosis.
Main Methods:
- Three-dimensional models of right coronary arteries were reconstructed from CT images of ten healthy individuals.
- Blood flow simulations were performed using realistic boundary conditions.
- Pearson correlation analysis was used to correlate geometric parameters with hemodynamic descriptors (e.g., wall shear stress).
Main Results:
- Strongest correlations between geometry and hemodynamics were observed in middle and distal segments.
- Decreased ostium area led to reduced wall shear stress (WSS) from proximal to distal segments (r=0.82).
- Right-ventricular branch geometry (area, angle, tortuosity) showed very strong correlations with WSS (r>0.90).
Conclusions:
- Low tortuosity, smaller cross-sectional area, and higher angle of the right-ventricular branch promote hemodynamic conditions favorable for atherosclerosis.
- The right-ventricular branch geometry appears to be a key determinant of the right coronary artery's hemodynamic behavior.
Purpose:
Coronary artery geometry can have a significant impact in the hemodynamic behavior of coronary blood flow, influencing atherosclerotic plaque formation. The present work focuses on, through a statistical study, the connection between several geometric parameters of the right coronary artery-ostium cross-sectional area, angles between the common trunk and the side-branches, tortuosity, curvature and cross-sectional area in each side-branch-and their influence on hemodynamic descriptors. Parameters such as low wall shear stress and local disturbed flow, which are associated with atherosclerosis formation, were analysed.
Methods:
Computed tomography images of ten healthy individuals were selected to reconstruct in vivo three-dimensional models of right coronary arteries. Blood flow was simulated through a compliant model with realistic boundary conditions. Calculated hemodynamic descriptors values were correlated with the geometric parameters using the Pearson correlation coefficient (r) and the p value.
Results:
The strongest correlations were found in the middle and distal segments of the right coronary artery. A decrease in the ostium area promotes a decrease in the WSS magnitude from the proximal to the distal segment (r = 0.82). Very strong correlations (r > 0.90) were achieved between geometric parameters (cross-sectional area, angle, tortuosity) of the right-ventricular branch and the wall shear stress magnitude in the middle and distal segments.
Conclusions:
Low values of tortuosity, smaller cross-sectional area and higher angle of the right-ventricular branch leads to a hemodynamic behavior more propitious to atherosclerosis formation, within the study cases. The right-ventricular branch seems to have the highest influence in the hemodynamic behavior of the right coronary artery.
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