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Background  The platelet to lymphocyte ratio (PLR), an indirect inflammatory biomarker, has been recently demonstrated to be associated with severity of coronary artery disease. In the present study, we sought to investigate whether PLR is associated with vulnerable plaque characteristics of non-culprit lesions in patients with acute coronary syndrome (ACS).    Methods  The patients in our study were divided into two groups (high PLR group and low PLR group). A total of 119 non-culprit plaques from 71 patients with ACS were assessed by optical coherence tomography (OCT).    Results  The non-culprit plaques in high PLR group exhibited thinner fibrous cap thickness (FCT) (88.60 ± 44.70 vs. 119.28 ± 50.22 μm,  P  = 0.001), greater maximum lipid arc (271.73 ± 71.66 vs. 240.60 ± 76.69°,  P  = 0.027) and increased incidence of thin-cap fibroatheroma (TCFA) (34.0% vs. 15.9%,  P  = 0.022) compared with those in low PLR group. Meanwhile, PLR was negatively associated with FCT ( r  = −0.329,  P  < 0.001). Furthermore, multivariate regression analysis showed that PLR [OR: 1.023 (95% CI: 1.005–1.041),  P  = 0.012] and LDL-C [OR: 1.892 (95% CI: 1.106–3.239),  P  = 0.020] were significant predictors of TCFA.    Conclusions  High level of PLR may be associated with vulnerable plaque features of non-culprit lesions in patients with ACS. PLR, a cheap and easily available index, may surve as a useful inflammatory marker in reflecting plaque vulnerability.

bmc cardiovascular disorders

Association of Platelet to lymphocyte ratio with non-culprit atherosclerotic plaque vulnerability in patients with acute coronary syndrome: an optical coherence tomography study