Abstract

Because a useful biomarker for painless myocardial infarction (MI) has yet to be identified, the aim of this study was to identify a biomarker for diabetic patients with painless MI. A case-control design was used to compare inflammatory cytokine levels among 111 patients with diabetes mellitus, including 31 patients with stable coronary heart disease (CHD), 30 patients with painful MI, 20 patients with painless MI, and 30 age- and sex-matched patients without CHD (control group). In addition to baseline parameters, cytokine levels, including plasma high sensitivity C-reactive protein (HsCRP), interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), and soluble CD40 ligand (sCD40L) levels, were analyzed using enzyme-linked immunosorbent assays (ELISAs). No differences in baseline characteristics were observed for patients with painless MI as compared to the other patient groups. Significantly higher sCD40L, HsCRP, IL-6, and TNF-α levels were detected in patients with MI, and markedly elevated sCD40L and IL-6 levels were observed in patients with painless MI as compared to those with painful MI. sCD40L may be a useful biomarker for painless MI in diabetic patients, which could reduce misdiagnosis and expedite treatment. Further studies are required to validate the diagnostic utility of this putative biomarker as well as investigate the mechanism by which sCD40L is elevated in these patients.

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