High-Density Lipoprotein Cholesterol Level Is Associated With Fibrous Cap Thickness in Acute Coronary Syndrome

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Background: Although low high-density lipoprotein cholesterol (HDL-C) level has been reported as an independent risk factor for coronary artery disease, few studies addressed the direct relationship between the presence of thin-cap fibroatheroma (TCFA) that is considered as vulnerable plaque in pathology and HDL-C level. The aim of this study was to investigate whether lesion vulnerability is related to HDL-C level in patients with acute coronary syndrome (ACS). Methods and Results: A total of 261 patients with ACS who underwent optical coherence tomography prior to percutaneous coronary intervention, were enrolled. Patients were divided into a TCFA group (n=124) and a non-TCFA group (n=137). TCFA was defined as a lipid plaque (lipid content in ≥1 quadrant) covered with <70m-thickness fibrous caps. There were no differences in patient characteristics and clinical results between the 2 groups except for HDL-C level, low-density lipoprotein cholesterol (LDL-C) level, and high-sensitive C-reactive protein (hs-CRP) level. On multivariate regression analysis, low HDL-C level (β coefficient: 0.302, P<0.001), high LDL-C level (β coefficient: −0.172, P=0.008), hs-CRP level (β coefficient: −0.145, P=0.017), and current smoking (β coefficient: −0.124, P=0.028) were identified as independent contributors to fibrous cap thickness. Conclusions: HDL-C is correlated with fibrous cap thickness of the culprit lesion in patients with ACS. HDL-C may be considered as a therapeutic target for plaque stabilization.

High-Density Lipoprotein Cholesterol Level Is Associated With Fibrous Cap Thickness in Acute Coronary Syndrome

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