3 . to observe the proliferation and apoptosis of vascular smooth muscle cells ( vsmcs ) both from internal mammary artery ( ima ) and saphenous vein ( sv ) from patients undergoing cabg and to investigate the inhibition of vnp on the proliferation of vsmcs from ima and sv . methods : 1 3 ）观察在冠状动脉旁路移植术（ coronaparterybypassgrafting ， cabg ）中用于移植的血管? ?乳内动脉（ internalmammnyrteryima ）和大隐静脉（ saphenousvein ， sv ）的血管平滑肌细胞的增殖和凋亡，并研究vnp抑制ima和sv血管平滑肌细胞增殖的作用。
