Complex patients had at least one of the following characteristics : renal insufficiency ( creatinine140 mol/l ) ; ejection fraction < 30 % ; acute myocardial infarction ( MI ) within previous 72 hrs ; > 1 lesion/vessel ; > 2 vessels treated ; lesion length > 27 mm ; bifurcation ; saphenous vein graft lesion ; arterial bypass graft lesion ; in-stent restenosis ; unprotected left main lesion ; lesion with thrombus ; or lesion with total occlusion .