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Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression
Published on: January 15, 2022
Relationship between the dynamic geometry and wall thickness of a human coronary artery
1Department of Biomedical Engineering, Duke University, Durham, NC 27708-0281, USA.
Insights
Coronary artery motion and geometry influence atherosclerosis development. Dynamic geometric factors, like curvature and torsion, correlate with early artery wall thickening, supporting their role in disease localization.
Area of Science:
- Cardiovascular Research
- Biomedical Engineering
- Pathophysiology
Background:
- Atherosclerosis initiation and development are linked to hemodynamic and wall mechanical forces.
- Arterial dynamics and geometry are key mediators of these forces in the coronary vasculature.
Purpose of the Study:
- To investigate the hypothesis that coronary artery motion and geometry influence local disease predisposition.
- To understand the impact of arterial dynamics and geometry on stresses within the artery wall.
Main Methods:
- Characterized human right coronary artery dynamics using biplane cineangiograms.
- Assessed wall thickness variation with intravascular ultrasound.
- Employed multiple regression analyses with principal components on dynamic geometry parameters (displacement, strain, curvature, torsion).
Main Results:
- No single dynamic geometry parameter solely determined wall thickness.
- Linear combinations of dynamic geometry parameters predicted wall thickness (P<0.001; R2=0.17-0.44).
- Curvature and torsion (time-average and cyclic variation) positively correlated with maximum wall thickness and asymmetry.
Conclusions:
- Observed relationships support the hypothesis that dynamic geometry influences the localization of early coronary artery thickening.
- Findings suggest a role for arterial motion and shape in the spatial distribution of atherosclerotic changes.
Objective:
It is widely recognized that hemodynamic and wall mechanical forces are involved in the initiation and development of atherosclerosis. In the coronary vasculature, these forces are likely mediated by arterial dynamics and geometry. This research examines the hypothesis that coronary artery motion and geometry affect the local predisposition to disease, presumably through their influence on the stresses at and in the artery wall.
Methods And Results:
The dynamics of a human right coronary artery and the variation of wall thickness along its length were characterized from biplane cineangiograms and intravascular ultrasound records, respectively. The dynamic geometry parameters were distance along the vessel, cyclic displacement, axial strain, curvature, and torsion. Multiple regression analyses using principal components show that (1) no single dynamic geometry parameter has a dominant influence on wall thickness, (2) linear combinations of such parameters predict wall thickness measures with high confidence (P<0.001; R2 between 0.17 and 0.44), and (3) both the time-average values of curvature and torsion and their excursion during the cardiac cycle are positively correlated with maximum wall thickness and cross-sectional asymmetry.
Conclusions:
The relationships seen here support the hypothesis that dynamic geometry plays a role in the localization of early coronary artery thickening.
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