The occlusion of Left anterior descending coronary artery ( LAD) or Right coronary artery (RCA) may also be further respectively classified into Group C/D (n = 14/11) and Group E/F (n = 10/15).

• 又根据闭塞部位不同分为：前降支闭塞C/D(n=14/11)两组； 右冠闭塞E/F(n=10/15)两组，其中C组与E组为侧支循环建立不良组；