Fluid-structure simulations outperform computational fluid dynamics in the differentiation of progressive dilation in Marfan syndrome patients
Data files
Jan 28, 2020 version files 2.78 GB
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MFN14F.ensi.case
2.72 KB
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MFN14F.ensi.DISPM-000002
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MFN14F.ensi.DISPM-000003
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MFN14F.ensi.geo
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MFN14F.ensi.PRESS-000002
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Ratio.m
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Readme.docx
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ShearStress.m
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Abstract
Introduction: Abnormal fluid dynamics at the ascending aorta may be at the origin of aortic aneurysms. This study was aimed at comparing the performance of computational fluid dynamics (CFD) and fluid-structure interaction (FSI) simulations against 4D-flow MRI data; and to assess the capacity of advanced fluid dynamics markers to stratify aneurysm progression risk.
Methods: Eight Marfan syndrome patients, four with stable and four with dilating aneurysms of the proximal aorta, and four healthy controls were studied. FSI and CFD simulations were performed with MRI-derived geometry, inlet velocity field and Young’s modulus. Flow displacement, jet angle and maximum velocity evaluated from FSI and CFD simulations were compared to 4D-flow MRI data. A dimensionless parameter, the shear stress ratio, was evaluated from FSI and CFD simulations and assessed as potential correlate of aneurysm progression.
Results: FSI simulations successfully matched MRI data regarding descending to ascending aorta flow rates (R2=0.92) and pulse wave velocity (R2=0.99). Compared to CFD, FSI simulations showed significantly lower percentage errors in ascending and descending aorta in flow displacement (-46% ascending, -41% descending), jet angle (-28% ascending, -50% descending) and maximum velocity (-37% ascending, -34% descending) with respect to 4D-flow MRI. FSI- but not CFD-derived shear stress ratio differentiated between stable and dilating Marfan patients.
Conclusions: Fluid dynamic simulations of the thoracic aorta require fluid-solid interaction to properly reproduce complex hemodynamics. FSI- but not CFD-derived shear stress ratio could help stratifying Marfan patients.