CORONARY VENOUS BYPASS GRAFT FAILURE, HEMODYNAMIC PARAMETERS INVESTIGATION

摘要

The purpose of this paper was to investigate the hemodynamic parameters associated to the blood flow in failed coronary venous bypass graft using computational fluid dynamics (CFD) technique. Narrowed section creates bypass graft constriction. This change of the flow direction alters significantly the local hemodynamic parameters. In this paper, a patient specific three-dimensional bypass model is used to simulate blood flow in narrowed venous bypass graft for understanding the detailed flow physics of transition to turbulence downstream of the graft curvature and the narrowed section. In conclusion, successive curvature and sudden narrowing of the bypass graft induce disturbance of the flow profile that produce high local WSS and large recirculation regions. Both this parameters create favorable conditions to the initiate the graft failure.