春秋战国晚期（公元前4世纪）有套有木制胸轧的马的画卷（楚国文物）。

In the late feudal period (4th Century BC) there is pictorial evidence (from the Chinese state of Chu) of a horse with a wooden chest yoke.

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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;

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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;

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