Blood Flow Pattern in a Coronary Bypass with Moderate Stenosis

Coronary artery is one of the high risk vessels forstenosis and decrease of cardiac flow via stenosis may lead toischemia. Coronary artery bypass graft (CABG) providessufficient blood for myocardium. Knowledge of CABGhemodynamic helps us to provide a better graft. ComputationalFluid Dynamics (CFD) is an appropriate method to predictblood flow pattern in Atherosclerosis. Combination of pulsatileblood flow and artery displacement makes more realisticresults for CABG. There is a big question about effectiveness ofa bypass in moderate stenosis. In this study a moderate stenosiswith linear elastic wall and Newtonian blood flow consideredand pulsatile aortic pressure assumed for inlet and outlet.ADINA was used to solve Fluid-Structure Interaction (FSI) andsimulation results show that small vessels cannot providesignificant flow compared with stenosed coronary. Wall Shearstress (WSS) is an important factor that may damageendothelium and it is increasing dramatically in the stenosis,while there is a small negative WSS after stenosis.

Keywords:

moderate stenosis , Coronary Bypass , FSI , Pulsatile pressure , circulation area