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Background Percutaneous coronary intervention (PCI) is gradually becoming the important treatment method for coronary artery disease (CAD) and peri-procedure myocardial injury (PMI) is a complication commonly see in CAD patients during PCI.Few studies are performed in investigating PMI.But as known to all; Danshen has certain effect in myocardial protection.So we observe the impacts of Danshen agents to peri-procedure myoc ardial injury in this study.