摘要Bifurcation coronary lesions are relatively frequent in today's interventional cardiology practice,averaging between 10％-15％ of all percutaneous coronary interventions(PCIs).1 Several problems inherent in the treatment of bifurcation lesions are periprocedural side branch(SB)compromise(composite of SB closure or appearance of significant ostial stenosis after main vessel(MV)stenting causing ischemia)frequently related to periprocedural myonecrosis,relatively higher restenosis rates especially in two-stent techniques,and higher rates of stent thrombosis in different time frames.1-4 The lead author and other investigators demonstrated that both periprocedural result and long-term results could be influenced by bifurcation angulations.The purpose of this study is to show why and how bifurcation angulations are important for bifurcation stenting.