最初的心脏支架是所谓「裸金属支架（bare metal stent），由于支架置入后就会引致血管受损，所以血管上的细胞会有反应，造成疤痕，这会导致血管再次变窄。
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Previously randomized clinical trails have shown that drug-eluting stents(DES) significantly reduces the risk of restenosis,including the need for reintervention,compared with bare-metal stents(BMS).
既往随机临床试验结果表明,与裸金属支架(bare metal stents,BMS)相比,药物洗脱支架(drug-eluting stents,DES)的应用显著的降低了术后再狭窄率及靶血管重建率。
参考来源 - 冠状动脉介入治疗患者临床疗效及服药依从性1年随访研究·2,447,543篇论文数据，部分数据来源于NoteExpress
最近一个注册试验是Pill博士采用裸金属支架的研究。
The last one those was a registry that Dr. Pills did with bare metal stents.
医生们都向其余的病人推荐更老的裸金属支架因为它们似乎不易出现迟发的血栓危险。
Doctors have switched other patients to older bare metal stents that do not appear to have the late-clotting risk.
裸金属支架的缺点是它们经常再一次发生堵塞，意味着病人要承受更多的重复操作的危险。
The disadvantage of the bare metal stents is that they reclog twice as often, which exposes patients to the risks of more repeat procedures.
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