in most instances , alleviation of angina could be related to either : ( 1 ) a patent bypass graft into an unchanged intrinsic coronary artery with presumed increased blood flow to the distal coronary segment , or ( 2 ) occlusion of the bypass graft and the corresponding coronary artery with probable infarction of previously ischemic myocardium .
C0010055
bypass graft
C0205042
coronary artery