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Pulsatile hemodynamics in patient-specific thoracic aortic dissection models constructed from computed tomography
Jacky Ka Long Ko1, Ryan Wen Liu1, Diya Ma1
1Department of Imaging and Interventional Radiology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong.
Journal of X-Ray Science and Technology
|February 25, 2017
Summary
Thoracic aortic dissection (TAD) involves catastrophic cardiovascular events. This study used computational fluid dynamics (CFD) to analyze hemodynamics in a TAD model, revealing high wall shear stress at dissection initiation and progression along the false lumen.
Area of Science:
- Cardiovascular Science
- Biomedical Engineering
- Fluid Dynamics
Background:
- Thoracic aortic dissection (TAD) is a severe cardiovascular condition with high mortality.
- Understanding hemodynamics in TAD is crucial for improving clinical outcomes.
Purpose of the Study:
- To investigate pulsatile hemodynamic changes in a Stanford Type B TAD model.
- To utilize computational fluid dynamics (CFD) for detailed analysis of blood flow dynamics.
Main Methods:
- Reconstruction of a patient-specific dissected aorta from 3D CTA scans.
- Application of realistic, time-dependent pulsatile boundary conditions.
- CFD simulations using the finite volume method to analyze blood flow velocity, pressure, wall shear stress, and vorticity.
Main Results:
- High wall shear stress and strong vertical flow observed at the initiation of dissection.
- Progression of wall shear stress along the false lumen was identified.
- These findings suggest a potential mechanism for blood flow within aortic wall layers.
Conclusions:
- CFD analysis provides valuable insights into the complex hemodynamics of TAD.
- Understanding shear stress patterns may help predict dissection progression.
- Further research can explore therapeutic interventions based on these hemodynamic findings.
