Effect of Pulsatility on the Transport of Thrombin in an Idealized Cerebral Aneurysm Geometry

Abstract

Computational models of cerebral aneurysm thrombosis are designed for use in research and clinical applications. A steady flow assumption is applied in many of these models. To explore the accuracy of this assumption a pulsatile-flow thrombin-transport computational fluid dynamics (CFD) model, which uses a symmetrical idealized aneurysm geometry, was developed. First, a steady-flow computational model was developed and validated using data from an in vitro experiment, based on particle image velocimetry (PIV). The experimental data revealed an asymmetric flow pattern in the aneurysm. The validated computational model was subsequently altered to incorporate pulsatility, by applying a data-derived flow function at the inlet boundary. For both the steady and pulsatile computational models, a scalar function simulating thrombin generation was applied at the aneurysm wall. To determine the influence of pulsatility on thrombin transport, the outputs of the steady model were compared to the outputs of the pulsatile model. The comparison revealed that in the pulsatile case, an average of 10.2% less thrombin accumulates within the aneurysm than the steady case for any given time, due to periodic losses of a significant amount of thrombin-concentrated blood from the aneurysm into the parent vessel’s bloodstream. These findings demonstrate that pulsatility may change clotting outcomes in cerebral aneurysms.

Publication DOI: https://doi.org/10.3390/sym14010133
Divisions: College of Engineering & Physical Sciences > School of Engineering and Technology > Mechanical, Biomedical & Design
College of Engineering & Physical Sciences > Aston Institute of Urban Technology and the Environment (ASTUTE)
Additional Information: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). Funding: National Research Foundation, South Africa for funding the work through Thuthuka and NRF-FRF Sabbatical grants held by MNN, NRF KIC grant (KIC171023270560), and African Laser Centre research grant (LHIN500 task ALC-R017) held by W.H.H. This work is also based on research supported by the National Research Foundation of South Africa (Grant Number: 89916) held by AGM.
Uncontrolled Keywords: intracranial aneurysm,thrombosis,pulsatile flow,CFD,PIV
Publication ISSN: 2073-8994
Full Text Link:
Related URLs: https://www.mdp ... 3-8994/14/1/133 (Publisher URL)
PURE Output Type: Article
Published Date: 2022-01-11
Accepted Date: 2021-11-22
Authors: Hume, Struan
Tshimanga, Jean-Marc Ilunga
Geoghegan, Patrick (ORCID Profile 0000-0003-1224-0477)
Malan, Arnaud G.
Ho, Wei Hua
Ngoepe, Malebogo N.

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