Numerical Investigation of Model Fusiform Aneurysms: Influence of Maximum Diameter to Height Ratio

Abstract

In the current clinical practice, the rupture risk prediction of fusiform aneurysms is based on maximum diameter. This approach does not account for the size and shape dependent cyclic stresses arising due to fluid-solid interaction (FSI). Previous fluid-structure interaction studies by the authors on model two dimensional fusiform aneurysms (abdominal aortic aneurysm (AAA)) has revealed that the maximum diameter to height ratio (DHr) could possibly be used as a critical parameter, since it can signify the hemodynamic and biomechanical stresses [7]. Hence the present study assesses whether the observations from the shape index based 2D simulations hold good in realistic 3D conditions as well. Based on the preliminary investigations, it is hypothesized, that a combination of Dmax and DHr would be a better indicator of rupture risk.

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