Question

帮忙翻译并分析一下句子结构，谢谢

We also decided to report risks for patients who had a previous PCI performed at their index event to assess whether longer-term outcomes differed patients compared with patients who received only pharmacotherapy(consiered high-risk patients).

Answer 1

我们决定报告那些之前接受过经皮冠状动脉介入治疗病人的风险，已将它们和那些仅仅接受过药物治疗的病人进行对比，看他们的长期治疗效果是否有所区别。 主句结构就是we ...report sth to assess sth

追问

their index event 中的index 是指数的意思，请问在这里怎么理解？

追答

在医学领域，index event指反应需要停药时出现的症状，也叫指示事件