对于比较血管成形术和锻炼带来的效果优劣，目前还只有两次非常小的检验，并且都没有证实血管成形术有任何长期优势。
There have been only two very small trials comparing angioplasty with exercise and both failed to show any long term advantage for angioplasty.
或许是这些非常小的颗粒物确实通过肺部血管进入血流，然后开始影响全身血管。
Or it could be that these very small particles actually enter the blood stream through vessels in the lung, and then begin affecting blood vessels throughout the body.
其中之一是荟萃分析提示，罗格列酮可能使心血管事件增加，非常小但可能的增加。
One of them was that rosiglitazone in meta-analysis suggested that there might be an increase in cardiovascular events; a very small but possible increase.
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