Complex patients had at least one of the following characteristics : renal insufficiency ( creatinine@ mol/l ) ; ejection fraction < @ % ; acute myocardial infarction ( MI ) within previous @ hrs ; > @ lesion/vessel ; > @ vessels treated ; lesion length > @ 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 .