|Title:||A Computational Assessment of Two Arterial Switch Operations||Authors:||CHIU, ING-SH||Keywords:||ASO;TGA;SRGA;Lecompte;mixed tri-quadratic finite element;streamline upwind model||Issue Date:||2006||Journal Volume:||v.20||Journal Issue:||n.3-4||Start page/Pages:||p-p||Source:||INTERNATIONAL JOURNAL OF COMPUTATIONAL FLUID DYNAMICS||Abstract:||
Two arterial switch operations (ASO) designed for transposition of great arteries with ventricular septal defect are numerically assessed. To prove that the SRGA ( spiral relationship of the normally related great arteries) arterial switch operation (ASO) is hemodynamically superior to that of the Lecompte procedure, three-dimensional Navier- Stokes simulations were carried out in the resulting two different vessels. In the mixed tri-quadratic finite element formulation, the streamline upwind model developed on the sup-inf-satisfying elements is employed to enhance convective stability. For the sake of accuracy, the degree of upwinding needed to enhance stability is analytically derived on the one-dimensional basis. For quantitative assessment of the two investigated operations, we calculate the pressure on the vessel surface and the wall shear stress from the simulated velocities. It is found that SRGA surgery is accompanied with lower pressure and higher shear stress, in comparison with those obtained from the Lecompte operation. Additionally, SRGA surgery results in much smaller areas of high pressure and low shear stress. Evidence is also given to show that the SRGA manoeuvre is less susceptible to stenosis. We also show that SRGA is the operation of choice for the ASO from the energy point of view since this anatomy is associated with smaller total energy loss coefficient and hydraulic dissipated power index .
|Appears in Collections:||醫學系|
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