PICAS was extremely difficult in coronary complex disease, sever or closed lesions and longer lesion but success rate was high when technical operation was very skilled.

冠脉复杂病变，重度或闭塞病变，以及长段病变的PICAS的难度大，但技术操作熟练，成功率也高。

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This is the reason that as the years go by, more and more break outs fail and the success rate of technical patterns diminish.

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