而且她们细小的冠状动脉血管，就是主动脉树上的分枝，在需要的时候很难被扩大，更加限制了血流。
What's more, their smaller coronary arteries-the twigs on the arterial tree-can fail to dilate when they should, further restricting blood flow.
左、右冠状动脉在主动脉窦的开口部位，以窦内占多数，分别为87。
Most of the openings of left and right coronary artery were in the aortic sinus, which were 87.
目的探讨主动脉内球囊反搏(IABP)辅助下行非体外循环冠状动脉旁路移植术(OPCAB)的治疗经验。
Objective To explore the experience of intra-aortic balloon pump (IABP) with the assistance of off-pump coronary artery bypass grafting (OPCAB) for the treatment of high risk coronary disease.
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