Why the study?
Current guidelines recommend an LDL-C target below 55 mg/dL for patients with very high-risk ASCVD, yet outcomes-based evidence directly validating this target relative to higher levels remains limited.
Does achieving very low LDL-C (less than 55 mg/dL) reduce major adverse cardiovascular events (MACE) compared with higher LDL-C levels in adults with established ASCVD?
Meta-Analysis (n=80,093)
Does achieving very low LDL-C (less than 55 mg/dL) reduce major adverse cardiovascular events (MACE) compared with higher LDL-C levels in adults with established ASCVD?
Achieving an LDL-C target below 55 mg/dL in patients with established ASCVD significantly reduces MACE, non-fatal MI, non-fatal stroke, and coronary revascularization without excess safety risk, supporting current guideline targets.
Answers are grounded in this paper and cite their sources.
Supports LDL-C <55 mg/dL target in ASCVD to reduce MACE; reinforces guidelines from meta-analysis of five major RCTs.
Background: Current guidelines recommend an LDL-cholesterol (LDL-C) target below 55 mg/dL for patients with very high-risk atherosclerotic cardiovascular disease (ASCVD). Yet, outcomes-based evidence directly validating this target relative to higher levels remains limited. Research Question: Does achieving very low LDL-C (less than 55 mg/dL) reduce major adverse cardiovascular events (MACE) compared with higher LDL-C levels in adults with established ASCVD? Methods: Systematic review and meta-analysis per PRISMA 2020. PubMed, EMBASE, and Cochrane CENTRAL were searched through March 2026. Eligible studies were randomized controlled trials enrolling adults with established ASCVD that compared intensive lipid-lowering therapy to achieve LDL-C <55 mg/dL with less intensive therapy or placebo. The primary outcome was MACE (cardiovascular death, non-fatal myocardial infarction, non-fatal stroke). Secondary outcomes included all-cause mortality, cardiovascular mortality, non-fatal myocardial infarction, non-fatal stroke, coronary revascularization, hospitalization for unstable angina, and safety outcomes. Pooled risk ratios (RR) with 95% confidence intervals (CI) were calculated using random-effects models. Evidence certainty was assessed using GRADE. Results: Five trials met inclusion criteria (FOURIER, ODYSSEY OUTCOMES, IMPROVE-IT, Ez-PAVE, REAL-CAD; N=80,093). Forest plot analysis showed intensive lipid-lowering significantly reduced MACE (RR 0.86, 95% CI 0.80-0.93; GRADE: Low), non-fatal myocardial infarction (RR 0.78, 95% CI 0.69-0.89; GRADE: Low), non-fatal stroke (RR 0.85, 95% CI 0.74-0.98; GRADE: Moderate), and coronary revascularization (RR 0.85, 95% CI 0.80-0.91; GRADE: Low). All-cause mortality (RR 0.94, 95% CI 0.85-1.04; GRADE: Very Low), cardiovascular mortality (RR 0.95, 95% CI 0.87-1.05; GRADE: Low), and hospitalization for unstable angina (RR 0.87, 95% CI 0.72-1.05; GRADE: Very Low) were not significantly different. Safety outcomes, including new-onset diabetes (RR 1.01), neurocognitive events (RR 0.97), and adverse events (RR 1.01), did not differ significantly (all GRADE: Low to Very Low). Certainty was downgraded for risk of bias, heterogeneity, and imprecision. Conclusions: In adults with established ASCVD, achieving LDL-C below 55 mg/dL significantly reduces MACE, non-fatal myocardial infarction, non-fatal stroke, and coronary revascularization without excess safety risk. However, the certainty of the evidence is low to moderate. These findings support guidelines recommending intensive LDL-C targets in very high-risk patients
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Shahid et al. (2026) conducted a meta-analysis in Established atherosclerotic cardiovascular disease (ASCVD) (n=80,093). Intensive lipid-lowering therapy to achieve LDL-C <55 mg/dL vs. Less intensive lipid-lowering therapy or placebo (higher LDL-C levels) was evaluated on Major adverse cardiovascular events (MACE: cardiovascular death, non-fatal myocardial infarction, non-fatal stroke) (RR 0.86, 95% CI 0.80-0.93).
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