FLOW ANALYSIS THROUGH AN ARTERIOVENOUS FISTULA OBTAINED FROM COMPUTED TOMOGRAPHY
Fábio César Miranda Oliveira1; Kleiber Lima de Bessa1; Ricardo Wagner da Costa Moreira1
1 UFRN
doi:10.20906/CPS/CON-2016-1174
Resumo
The arteriovenous fistula (AVF) is the prefered vascular access for hemodialysis, but vascular complications like thrombosis, aneurism and intimal hyperplasia often occur. Recirculation zones, stagnation points, secondary flow and low and high shear stress are the main causes of these complications. In this work is used computational fluid dynamics (CFD) for analyze the blood flow dynamics and understand better the influence of biomechanical forces in the development of vascular complications. A end-to-end AVF geometry model is provided from computerized tomography images which allowed generate a three-dimensional mesh for numerical analysis of blood flow. A velocity waveform was used as boundary condition. The streamlines shows flow separation near of the anastomosis and a increasing turbulence along the vein. The wall shear stress was beyond of normal physiological values in the diastolic phase, contributing to appear some pathologies.
Palavras-chave: Fístula; CFD; Recirculation; Wall shear stress