Key result
Circular cerebral aneurysm necks are linked to ~41% higher rupture risk versus elliptical necks.
Biomechanical simulations suggest that cerebral aneurysms with circular necks have significantly higher wall shear stress and rupture risk compared to those with elliptical necks.
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Suggests FSI modeling for aneurysm assessment; leaves open clinical translation pending larger validation.
In this study, one normal subject and two patients suffering from a cerebral aneurysm with circular and elliptical necks are analyzed by using the fluid-structure interaction (FSI) method. Although the blood hemodynamics parameters increase after the occurrence of the disease, the largest increase is in the wall shear stress (by a factor of 4.1–6.5) as compared to the normal subject. The increase in these parameters for patients with a circular neck is more pronounced than that with an elliptical neck. The blood flow becomes slightly more turbulent after the occurrence of the cerebral aneurysm, though it still remains in the range of the laminar flow and the pulsatility of the blood flow in patients is 28–45% greater than that of the normal subject. Finally, the results show that the risk of vessel rupture in the cerebral aneurysm with a circular neck is 40.8% higher than that in the case of the cerebral aneurysm with an elliptical neck.
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Hajirayat et al. (2017) studied Cerebral aneurysm (n=3). Cerebral aneurysm with circular neck vs. Cerebral aneurysm with elliptical neck and normal subject was evaluated on Risk of vessel rupture (40.8% higher). Cerebral aneurysms with a circular neck had a 40.8% higher risk of vessel rupture compared to those with an elliptical neck.
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