Background And Aims: The residual risk of atherosclerotic cardiovascular disease (ASCVD) in patients with diabetes on statin therapy warrants identification of other pro-atherogenic drivers. Lipoprotein(a) [Lp(a)] promotes the formation of necrotic cores within vessel walls. Given that patients with diabetes have an Lp(a)-associated ASCVD risk, Lp(a) might lead to plaque vulnerability in patients with diabetes on statin therapy.
Methods: We analyzed target lesions that underwent PCI in 312 patients with coronary artery disease (CAD) on statin treatment from the REASSURE-NIRS registry (NCT04864171). Maximum 4-mm lipid-core-burden index (maxLCBI) in target lesions was measured with near-infrared spectroscopy (NIRS) imaging. The relationship between Lp(a) levels and maxLCBI was investigated in patients with and without diabetes.
Results: High-intensity statin use (p = 0.49) and on-treatment low-density lipoprotein cholesterol (LDL-C) (p = 0.32) and Lp(a) levels (p = 0.09) were comparable between patients with and without diabetes. Lp(a) levels were significantly associated with maxLCBI in patients with diabetes (p = 0.01) but not in patients without diabetes (p = 0.96). Multivariate analysis showed that LDL-C levels (p = 0.03) predict maxLCBI in patients without diabetes, but not Lp(a) levels (p = 0.91). Both LDL-C (p = 0.01) and Lp(a) (p = 0.04) levels were independent predictors of maxLCBI in patients with diabetes. Even in patients with diabetes achieving LDL-C <1.8 mmol/L (70 mg/dL), Lp(a) levels remained associated with maxLCBI (p = 0.04).
Conclusions: A significant relationship between Lp(a) and maxLCBI exists in patients with diabetes and CAD on statin treatment, even with LDL-C <1.8 mmol/L (70 mg/dL). Lp(a) might be associated with more vulnerable coronary atheroma in patients with diabetes despite receiving statin therapy.
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