Objectives: MicroRNA (miR)-146a and miR-21 have been reported to participate in inflammatory reactions and fibrosis.Excessive inflammation and cardiac fibrosis may play important roles in the development of left ventricular remodeling(LVR). This study assessed whether miR-146a, miR-21 and other biomarkers could predict LVR after myocardial infarction(MI).
Methods: Circulating miR-146a, miR-21 and other biomarker levels were measured in 198 patients with acute MI 5 days after primary percutaneous coronary intervention(PCI). All patients were assessed by transthoracic echocardiography on day 5 and 1 year after primary PCI.
Results: Concentrations of circulating miR-146a, miR-21, C-reactive protein, creatine kinase MB type and troponin I, as well as estimated glomerular filtration rate (eGFR) and left ventricular ejection fraction (LVEF), were significantly higher in patients with than in those without LVR (p < 0.05). Multivariate logistic regression analysis showed that circulating miR-146a (odds ratio, OR = 2.127, p < 0.0001), miR-21 (OR = 1.119,p < 0.0001), eGFR (OR = 0.939, p = 0.0137) and LVEF (OR =0.802, p = 0.0048) were independent predictors of LVR development. The area under the curve for the combination of miR-146a and miR-21 was significantly higher than for either alone.
Conclusion: Circulating miR-146a and miR-21 may be novel biomarkers predictive of LVR after acute MI. Their combination may better predict LVR than either alone.
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