The usage of ow-diverting stents in the treatment of intracranial aneurysms is widespread due to their high success and low complication rates. However, their use is still not o cially recommended for bifurcation aneurysms, as there is a risk of generating ischemic complications due to the reduced blood ow to the jailed branch. Many works utilize computational uid dynamics (CFD) to study how hemodynamic variables respond to ow diverter placement, but few seem to use it to verify ow variation between branches of bifurcation aneurysms and to aid in the choice of the best rami cation for device placement. This investigation was performed in the present work, by comparing wall shear stress (WSS) and owrates for a patient-speci c scenario of a Middle Cerebral Artery (MCA) aneurysm, considering device placement on each branch. A secondary objective was to follow a methodology that provides fast results, envisioning application to daily medical practice. The device was simpli ed as a homogeneous porous medium and extreme porosity values were simulated for comparison. Results suggest that stent placement on either branch is both safe and effective, signi cantly reducing WSS and ow into the aneurysm while maintaining ow to the different rami cations within acceptable thresholds.

The usage of flow-diverting stents in the treatment of intracranial aneurysms is widespread due to their high success and low complication rates. However, their use is still not officially recommended for bifurcation aneurysms, as there is a risk of generating ischemic complications due to the reduced blood flow to the jailed branch. Many works utilize computational fluid dynamics (CFD) to study how hemodynamic variables respond to flow diverter placement, but few seem to use it to verify flow variation between branches of bifurcation aneurysms and to aid in the choice of the best ramification for device placement. This investigation was performed in the present work, by comparing wall shear stress (WSS) and flowrates for a patient-specific scenario of a Middle Cerebral Artery (MCA) aneurysm, considering device placement on each branch. A secondary objective was to follow a methodology that provides fast results, envisioning application to daily medical practice. The device was simplified as a homogeneous porous medium and extreme porosity values were simulated for comparison. Results suggest that stent placement on either branch is both safe and effective, significantly reducing WSS and flow into the aneurysm while maintaining flow to the different ramifications within acceptable thresholds.

RESUMO-A influência de variáveis hemodinâmicas no crescimento e ruptura de aneurismas tem sido crescentemente investigada com o uso de fluidodinâmica computacional. Perfis de escoamento e da tensão cisalhante são destacados na literatura como sinalizadores de ruptura. Neste trabalho estes parâmetros foram analisados através de simulações CFD em um aneurisma sacular localizado na artéria cerebral média (MCA) utilizando a geometria real de um paciente. Mesmo com a utilização de condições de contorno não específicas do paciente, os resultados mostram corroborar com a literatura.