Comput Methods Programs Biomed - Impact of aortic repair based on flow field computer simulation within the thoracic aorta.

Tópicos

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Resumo

Purpose of this computational study is to examine the hemodynamic parameters of velocity fields and shear stress in the thoracic aorta with and without aneurysm, based on an individual patient case and virtual surgical intervention. These two cases, case I (with aneurysm) and II (without aneurysm), are analyzed by computational fluid dynamics. The 3D Navier-Stokes equations and the continuity equation are solved with an unsteady stabilized finite element method. The vascular geometries are reconstructed based on computed tomography angiography images to generate a patient-specific 3D finite element mesh. The input data for the flow waveforms are derived from MR phase contrast flow measurements of a patient before surgical intervention. The computed results show velocity profiles skewed towards the inner aortic wall for both cases in the ascending aorta and in the aortic arch, while in the descending aorta these velocity profiles are skewed towards the outer aortic wall. Computed streamlines indicate that flow separation occurs at the proximal edge of the aneurysm, i.e. computed flow enters the aneurysm in the distal region, and that there is essentially a single, slowly rotating, vortex within the aneurysm during most of the systole. In summary, after virtual surgical intervention in case II higher shear stress distribution along the descending aorta could be found, which may produce more healthy reactions in the endothelium and benefit of vascular reconstruction of an aortic aneurysm at this particular location.

Resumo Limpo

purpos comput studi examin hemodynam paramet veloc field shear stress thorac aorta without aneurysm base individu patient case virtual surgic intervent two case case aneurysm ii without aneurysm analyz comput fluid dynam d navierstok equat continu equat solv unsteadi stabil finit element method vascular geometri reconstruct base comput tomographi angiographi imag generat patientspecif d finit element mesh input data flow waveform deriv mr phase contrast flow measur patient surgic intervent comput result show veloc profil skew toward inner aortic wall case ascend aorta aortic arch descend aorta veloc profil skew toward outer aortic wall comput streamlin indic flow separ occur proxim edg aneurysm ie comput flow enter aneurysm distal region essenti singl slowli rotat vortex within aneurysm systol summari virtual surgic intervent case ii higher shear stress distribut along descend aorta found may produc healthi reaction endothelium benefit vascular reconstruct aortic aneurysm particular locat

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