LMnintermediate branch artery,IBA)n锐缘支(acute marginal,AM)n左内乳动脉(left internal mammary artery,LIMA)n右内乳动脉(right internal mammary artery,RIMA)圆锥支中间支中间支指的是起源于左主干分叉部,行走于前降支与左旋支之间,供应左室游离壁的大分支血管,存在占37%42.3%coronary artery前前降降支支心心肌肌桥桥coronary stenosiscoronary stenosisProudilit将冠状动脉造影显示的冠脉狭窄程度分为6级:coronary stenosis