FED-Vol. 216, Unsteady Flows -1995 ASME 1995 RECURRENCE OF BALLOON TREATED INTRACRANIAL TERMINAL ANEURYSM: A STUDY WITH PULSATILE BLOOD FLOW

ABSIRAcr To identify the hemodynamic mechanisms associated with recurrence of intracranial aneurysms following the treatment with balloon or coil occlusion. Pulsatile flow in a terminal recurrent intracranial aneurysm was numerically simulated based on the physiological pulsatile flow observed in the middle cerebral artery. In order to quantify the reason for recurrence of terminal aneurysm. flow parameters including local maximum wall shear stress and pressure drop at the neck of the aneurysm was calculated. Though the maximum shear stress at the right neck of the aneurysm after the insertion of the balloon is significantly reduced. it is still two and a half times more than the normal maximum shear stress. It is observed that due to the residual neck left after the insertion of the balloon an inadequate reduction in shear stress is achieved at the right neck where the recurrence of aneurysm is initiated. It is clear that the structural alteration of the endothelial layers in the aneurysm neck, where the shear stress was high. was critical.