Abstract
In this paper, we study the correlation between the wall shear stress, a hemodynamical index derived from numerical simulations, and an new index MFA-ILT for the characterization of intraluminal thrombus (ILT) in the presence of abdominal aortic aneurysms. Based on the processing of medical images, we define our index MFA-ILT by projecting onto lumen surface a measure of the ILT thickness. From the physical point of view, hemodynamical indexes describe the mechanical stimuli at which the luminal surface of the vessel wall is subject to, due to blood flow. Specifically, we consider the time-averaged wall shear stress and the oscillatory shear index. The first index provides a measurement of the averaged magnitude of the shear stress; the second index measures the rate of change of shear stress. To reconstruct the hemodynamical indexes, we build in silico three-dimensional models. We use the same physical parameters and boundary conditions for all the aneurysms in the sample. The computer simulations do not require any additional invasive patient examination. We consider eleven cases of abdominal aortic aneurysms spanning a wide range of different morphological features. All the cases are characterized by a thin intraluminal thrombus. We can, therefore, assume that the lumen we currently observe does not significantly differ from the one before the thrombus deposition. Our results suggest that the value of wall shear stresses and intraluminal thrombus deposition are correlated. Moreover, we conclude that in six cases time-averaged wall shear stress provides a preliminary indication of the area at risk of thrombus deposition.
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Acknowledgements
We thank the reviewers the careful reading and the constructive discussions. We gratefully acknowledge the CSCS for providing us the CPU resources under Project ID s635 and s796. Part of this work has been developed in the context of ERC Proof of Concept Grant MATH4AAARISK and of the FNS Project 200021E-168311, Domain-Decomposition-Based Fluid Structure Interaction Algorithms for Highly Nonlinear and Anisotropic Elastic Arterial Wall Models in 3D. The geometries considered in this study are taken from fully anonymous patients, named \(\hbox {AAA}_1\) to \(\hbox {AAA}_{11}\), as approved by the Ethical committee of the Fondazione IRCCS Ca’ Granda - Ospedale Maggiore Policlinico (Aut. 2373 12th April 2013).
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This study was funded by ERC-PoC (Grant Number 680420) and FNS (Grant 200021E-168311).
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Chiara Riccobene and Elisa Schenone are employee of the company MOXOFF; Alfio Quarteroni is co-founder and President of MOXOFF.
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Colciago, C.M., Deparis, S., Domanin, M. et al. Analysis of morphological and hemodynamical indexes in abdominal aortic aneurysms as preliminary indicators of intraluminal thrombus deposition. Biomech Model Mechanobiol 19, 1035–1053 (2020). https://doi.org/10.1007/s10237-019-01269-4
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DOI: https://doi.org/10.1007/s10237-019-01269-4