Zhang WY, Nan n, Song XT, et al. - Via a systematic review and meta-analysis of eight studies (n = 3,297), researchers evaluated whether depression in percutaneous coronary intervention (PCI) patients was related to a greater risk of adverse outcomes. A positive correlation between depression and adverse cardiovascular outcomes was observed by most of the studies. An aggregate risk ratio of 1.57 for the degree of the relationship between depression and adverse outcomes was noted. In patients undergoing PCI, it was suggested that depression is correlated with a greater risk of worse clinical outcomes or mortality. Also, a significant impact of evaluation time and length of follow-up on this conclusion was not seen.