Abstract
The aim of this study was to determine whether specific three-dimensional aortic shape features, extracted via statistical shape analysis (SSA), correlate with the development of thoracic ascending aortic dissection (TAAD) risk and associated aortic hemodynamics. Thirty-one patients followed prospectively with ascending thoracic aortic aneurysm (ATAA), who either did (12 patients) or did not (19 patients) develop TAAD, were included in the study, with aortic arch geometries extracted from computed tomographic angiography (CTA) imaging. Arch geometries were analyzed with SSA, and unsupervised and supervised (linked to dissection outcome) shape features were extracted with principal component analysis (PCA) and partial least squares discriminant analysis (PLS-DA), respectively. We determined PLS-DA to be effective at separating dissection and no-dissection patients (\(p = 0.0010\)), with decreased tortuosity and more equal ascending and descending aortic diameters associated with higher dissection risk. In contrast, neither PCA nor traditional morphometric parameters (maximum diameter, tortuosity, or arch volume) were effective at separating dissection and no-dissection patients. The arch shapes associated with higher dissection probability were supported with hemodynamic insight. Computational fluid dynamics (CFD) simulations revealed a correlation between the PLS-DA shape features and wall shear stress (WSS), with higher maximum WSS in the ascending aorta associated with increased risk of dissection occurrence. Our work highlights the potential importance of incorporating higher dimensional geometric assessment of aortic arch anatomy in TAAD risk assessment, and in considering the interdependent influences of arch shape and hemodynamics as mechanistic contributors to TAAD occurrence.
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Acknowledgments
This work was supported by a grant from the National Heart Lung and Blood Institute of the National Institutes of Health: 2RO1 HL109132-06 (TGG).
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There are no conflicts of interest for the work performed. TGG serves on a Medical Advisory Board for Abbott but receives no remumeration for this work.
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Williams, J.G., Marlevi, D., Bruse, J.L. et al. Aortic Dissection is Determined by Specific Shape and Hemodynamic Interactions. Ann Biomed Eng 50, 1771–1786 (2022). https://doi.org/10.1007/s10439-022-02979-0
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DOI: https://doi.org/10.1007/s10439-022-02979-0