Key result
Fluid-structure modeling shows high midpoint pressure and neck shear rates may predispose iliac aneurysms to rupture.
Computational fluid-structure interaction modeling reveals that iliac artery aneurysms experience increased shear rates at the neck and maximum pressure at the dilation midpoint, which may contribute to rupture risk.
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Should not yet change iliac aneurysm management; leaves open whether neck shear rates predict rupture in prospective studies.
The aneurysm of iliac artery is a rare entity and there are few computational models that have studied the disease. In this study, we have presented the flow patterns in the aneurysmal artery using Fluid–structure interaction method. The blood was assumed Newotonian, pulsatile, laminar, incompressible, and homogenous. The geometry of the model was made based on CT images of clinical cases. Using the computational method, we have obtained the velocity and pressure contours, shear rates and vortices for the healthy and aneurysmal artery. The results show that a pressure maximum was found at the midpoint of the dilation. The vortices are formed in the aneurysmal area 26 and shear rates do not change much. However, the rate increased in the neck of aneurysms. Furthermore, the aneurysm with bigger dilation tend to rupture due to more shear rates in the neck and the velocity at peak systole decreases in the aneurysmal area due to increase of the artery diameter. We have compared our results with some available relevant clinical data in discussion section.
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SABOONI et al. (2014) studied Iliac artery aneurysm. Fluid-structure interaction computational modeling vs. Healthy artery model was evaluated on Flow patterns, velocity, pressure contours, shear rates, and vortices. Fluid-structure interaction modeling of iliac artery aneurysms demonstrated maximum pressure at the dilation midpoint and increased shear rates in the aneurysm neck, which may predispose to rupture.
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