Abstract 11456: Elevated Lipoprotein(a) is Associated with Statin Resistance

Abstract

Introduction: LDL-C reduction by statins is the mainstay pharmacologic strategy for ASCVD risk reduction. Despite adherence, some patients fail to achieve LDL-C goals, a phenomenon known as statin resistance. Current LDL-C assays include cholesterol content on both lipoprotein(a) [Lp(a)] and LDL particles. Because statins do not lower Lp(a), Lp(a)-cholesterol may represent a statin insensitive pool within LDL-C. Hypothesis: Elevated Lp(a) contributes to statin resistance in patients treated with high-intensity statin therapy. Methods: A secondary analysis was performed on 2338 patients from the Myocardial Ischemia Reduction with Aggressive Cholesterol Lowering (MIRACL) trial, randomized to receive atorvastatin 80mg or placebo; baseline and week 16 lipid parameters were analyzed. Results: In the atorvastatin group (n = 1092), mean (SD) baseline LDL-C, absolute LDL-C reduction, median percent LDL-C change from baseline (IQR), and Lp(a) were 123.8 (33.5) mg/dL, 52.2 (36.7) mg/dL, -47.6% (-59.1- -29.9%), and 10.6 (5.1-29.1) mg/dL, respectively. Median (IQR) baseline Lp(a) was higher [12.1 (5.9-38.1) vs 9.2 (4.4-22.4) mg/dL, p < 0.001] in patients with attenuated percent LDL-C reduction compared to group median. The median percent LDL-C reduction on atorvastatin was 42.3% (24.3-52.5%) in patients with baseline Lp(a) between 50 - 99 mg/dL, and 32.6% (11.5-43.7%) with Lp(a) > 100 mg/dL prevalent in ~10% of the population, both significantly attenuated compared to patients with Lp(a) <30 mg/dL (50.4% [33.3-61.1%]), p < 0.001. An LDL-C target of 70 mg/dL or less was achieved in 62.3% of patients with baseline Lp(a) <30 mg/dL, compared to 55.2%, 43.3%, and 24.1% of those with Lp(a) 30 - 49 mg/dL, 50 - 99 mg/dL, and > 100 mg/dL (p < 0.001), respectively [Figure 1]. Conclusions: Elevated Lp(a) is associated with statin resistance and may identify patients who require additional or more potent lipid lowering therapies to achieve LDL-C goals.