Course of the effects of LDL-cholesterol reduction on cardiovascular risk over time: A meta-analysis of 60 randomized controlled trials

Abstract

Background and aimsIndividuals with or at high risk of cardiovascular disease (CVD) often receive long-term treatment with low-density lipoprotein cholesterol (LDL-C) lowering therapies, but whether the effects of LDL-C reduction remain stable over time is uncertain. This study aimed to establish the course of the effects of LDL-C reduction on cardiovascular risk over time. MethodsRandomized controlled trials (RCTs) of LDL-C lowering therapies were identified through a search in MEDLINE and EMBASE (1966-January 2023). The primary analyses were restricted to statins, ezetimibe, and proprotein convertase subtilisin–kexin type 9 (PCSK9) inhibitors, with other therapies included in sensitivity analyses. Random-effects meta-analyses were performed to establish the hazard ratio (HR) for major vascular events (cardiovascular death, myocardial infarction, unstable angina, coronary revascularization, or stroke) per 1 mmol/L LDL-C reduction. Course of the effects over time was assessed using random-effects meta-regression analyses for the association between follow-up duration, age, and the HR for major vascular events per 1 mmol/L LDL-C reduction. Additionally, treatment-by-time interactions were evaluated in an individual participant data meta-analysis of six atorvastatin trials. ResultsA total of 60 RCTs were identified (408,959 participants, 51,425 major vascular events). The HR for major vascular events per 1 mmol/L LDL-C reduction was 0.78 (95% confidence interval [CI] 0.75-0.81). Follow-up duration was not associated with a change in the HR for major vascular events (HR for change per year 0.994; 95% CI 0.970-1.020; p=0.66). The HR attenuated with increasing age in primary prevention (HR for change per 5 years 1.097; 95% CI 1.031-1.168; p=0.003), but not secondary prevention (HR for change per 5 years 0.987; 95% CI 0.936-1.040; p=0.63). Consistent results were found for statin trials only, and all trials combined. In the individual participant data meta-analysis (31,310 participants, 6,734 major vascular events), the HR for major vascular events did not significantly change over follow-up time (HR for change per year 0.983; 95% CI 0.943-1.025; p=0.42), or age (HR for change per 5 years 1.022; 95% CI 0.990-1.055; p=0.18). ConclusionsBased on available RCT data with limited follow-up duration, the relative treatment effects of LDL-C reduction are stable over time in secondary prevention, but may attenuate with higher age in primary prevention.