Effect of stenosis on hemodynamics in left coronary artery based on patient-specific CT scan
Sarfaraz Kamangar1, N J Salman Ahmed2, Irfan Anjum Badruddin1
1Department of Mechanical Engineering, College of Engineering, King Khalid University, Abha, Asir, Kingdom Saudi Arabia.
Insights
Computational simulations reveal how artery blockages (stenosis) affect blood flow, pressure, and wall stress in coronary artery disease patients. This improves understanding of stenosis progression and potential rupture in realistic artery models.
Area of Science:
- Cardiovascular Science
- Biomedical Engineering
- Computational Fluid Dynamics
Background:
- Coronary artery disease (CAD) is primarily caused by atherosclerosis, characterized by plaque buildup on artery walls.
- This buildup narrows arteries, impeding blood flow and increasing cardiovascular risk.
Purpose of the Study:
- To investigate the hemodynamic effects of significant arterial stenosis (>50%) in patients with suspected coronary artery disease.
- To analyze blood flow patterns, pressure changes, and wall shear stress in patient-specific coronary artery models.
Main Methods:
- Utilized patient-specific 3D computational models reconstructed from CT data of four individuals.
- Performed 3D computational fluid dynamics (CFD) simulations on left anterior descending (LAD) and left circumflex (LCX) artery models with >50% area stenosis.
- Calculated pressure, velocity, and wall shear stress throughout the cardiac cycle.
Main Results:
- Observed significant pressure drops and increased blood velocity across stenotic regions in LAD and LCX branches.
- Documented elevated wall shear stress in areas of stenosis.
- Identified recirculation zones downstream of the stenosis, contributing to plaque formation.
Conclusions:
- The study offers insights into the progression of arterial stenosis and the mechanisms leading to potential wall rupture.
- Enhanced understanding of blood flow dynamics in patient-specific coronary artery models is crucial for CAD management.
Background:
The most common cause of coronary artery disease (CAD) is vascular damage with the cholesterol built-up and other materials on the inner arterial wall, known as atherosclerosis.
Objective:
This paper aims to investigate the effect of stenosis on the hemodynamics in the four suspected coronary artery disease patients. Computer tomography (CT) data was acquired from patients of suspected coronary artery disease to reconstruct left coronary artery.
Methods:
The 3D computational simulation was carried out with four patient-specific models with area stenosis >50% located at the left anterior descending (LAD) and left circumflex (LCX) branches.
Results:
The pressure, velocity and wall shear stress were calculated during the cardiac cycle. A significant pressure drop across the stenosis and increase in the velocity at the stenosis were observed at LAD and LCX branches. An increase in the wall shear stress in the region of stenosis also observed with the prevalence of the recirculation zone at the post stenosis region which results in the formation of stenosis.
Conclusions:
Our analysis provides an insight into the progression of stenosis and wall rupture, thus improving our understanding the flow behavior patient-specific realistic artery models.
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