Blood flow pattern in a coronary bypass with moderate stenosis

Coronary artery is one of the high risk vessels for stenosis and decrease of cardiac flow via stenosis may lead to ischemia. Coronary artery bypass graft (CABG) provides sufficient blood for myocardium. Knowledge of CABG hemodynamic helps us to provide a better graft. Computational Fluid Dynamics (CFD) is an appropriate method to predict blood flow pattern in Atherosclerosis. Combination of pulsatile blood flow and artery displacement makes more realistic results for CABG. There is a big question about effectiveness of a bypass in moderate stenosis. In this study a moderate stenosis with linear elastic wall and Newtonian blood flow considered and pulsatile aortic pressure assumed for inlet and outlet. ADINA was used to solve Fluid-Structure Interaction (FSI) and simulation results show that small vessels cannot provide significant flow compared with stenosed coronary. Wall Shear stress (WSS) is an important factor that may damage endothelium and it is increasing dramatically in the stenosis, while there is a small negative WSS after stenosis.