Abstract:

Abstract:Objective To explore the effect of stent implantation on the hemodynamic characteristics of middle cerebral artery(MCA) aneurysm and analyze the effect of stent on hemodynamic factors such as wall shear stress.Methods One patient with  wide-neck MCA bifurcation aneurysm was analyzed before operation and during  follow-up  according to clinical images and using fluid dynamics software (ANSYS software) based on computational fluid dynamics(CFD) numerical simulation methods.The blood streamlines and wall shear stress were compared in both conditions.Results There was significant change in morphology of arteries after stent implantation and the aneurysm was gone.The angle of vascular bifurcation became smaller from 196.4° to 92.5°.The aneurysm disappeared completely.The distribution of wall shear stress on the surface of aneurysm turned uniform after stent implantation.The region of high wall stress  value near the neck of aneurysm was disappeared directly.Conclusion Stent implantation can change the partial hemodynamics of aneurysm and parent artery.The numerical simulation of CFD can directly reflect the hemodynamic characteristics of aneurysm.

Key words: intracranial aneurysms;hemodynamics process;computational fluid dynamics