By means of FEM, the physiologi cal blood flow in coronary bypass graft is simula ted. The stenosis in coronary artery is involved in the graft model, and the def ormation of graft end to allow the surgical suture with a smaller diameter coron ary is taken into consideration. The flow pattern, secondary flow and wall shear stress in the vicinity of anastomosis are analyzed. It is shown that a zone of low wall stress and high wall stress gradient exists downstream the toe. The flo or opposed to the anastomosis is an area of high wall stress and high wall stres s gradient. Both the toe downstream and the anastomosis bottom floor are prone t o intimal hyperplasia.
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