For sham operation group, expose heart by surgery and find left anterior descending (LAD) coronary artery, and then braid to make a ringer but remain the silk untensioned;
开胸暴露心脏后找到左冠前降支（LAD）穿线做套环，但不收紧结扎线；
For sham operation group, expose heart by surgery and find left anterior descending (LAD) coronary artery, and then braid to make a ringer but remain the silk untensioned;
开胸暴露心脏后找到左冠前降支（LAD）穿线做套环，但不收紧结扎线；
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