方法：成年健康家兔49只，体重2.5±0.5kg，手术开胸于冠状动脉左室支(leftventriclecoronaryartery，lva)主干穿线阻断，制作心肌缺血模型，逐级设定不同缺血时间及缺血频率。
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方法：缺血组结扎冠状动脉左室支中点；
Methods: Ligatured semipart of left coronary artery (ischemic group).
发达的冠状动脉侧支循环减少心肌梗死面积，保护左室功能和活力，降低死亡风险。
Well-developed coronary collaterals reduce the size of myocardial infarction, preserve left ventricular function and viability, and reduce the risk of death.
结果山羊冠状动脉心肌桥多见于左冠前室间支、后室间支和左室前支。
Results the myocardial bridge of coronary artery of goat could be seen mostly in the anterior interventricular branch, the posterior interventricular branch of the left coronary artery.
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