Distal Placement of an End-to-Side Bypass Graft Anastomosis: A 3D Computational StudyReport as inadecuate




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Journal of EngineeringVolume 2013 2013, Article ID 185823, 7 pages

Research ArticleDepartment of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA

Received 17 August 2012; Accepted 12 October 2012

Academic Editor: Alireza Khataee

Copyright © 2013 John Di Cicco and Ayodeji Demuren. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A three-dimensional 3D computational fluid dynamics study of shear rates around distal end-to-side anastomoses has been conducted. Three 51% and three 75% cross-sectional area-reduced 6 mm cylinders were modeled each with a bypass cylinder attached at a 30-degree angle at different placements distal to the constriction. Steady, incompressible, Newtonian blood flow was assumed, and the full Reynolds-averaged Navier-Stokes equations, turbulent kinetic energy, and specific dissipation rate equations were solved on a locally structured multiblock mesh with hexahedral elements. Consequently, distal placement of an end-to-side bypass graft anastomosis was found to have an influence on the shear rate magnitudes. For the 75% constriction, closer placements produced lower shear rates near the anastomosis. Hence, there is potential for new plaque formation and graft failure.





Author: John Di Cicco and Ayodeji Demuren

Source: https://www.hindawi.com/



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