Atorvastatin, Cardiovascular Events, and Disability-free Survival in Older Adults
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Abstract
Background
The effectiveness and safety of statins for the primary prevention of cardiovascular events and the extension of disability-free survival among older adults remain uncertain.
Methods
We conducted a double-blind, randomized, placebo-controlled trial at general medical practices across Australia. Community-dwelling adults at least 70 years of age with no history of cardiovascular disease, diabetes, or dementia were randomly assigned in a 1:1 ratio to receive atorvastatin at a dose of 40 mg once daily or identical placebo. The two primary end points were a composite of death from cardiovascular causes, nonfatal myocardial infarction or stroke, or coronary revascularization (to assess effects on major cardiovascular events) and a composite of death from any cause, dementia, or persistent physical disability (to assess effects on disability-free survival). Analyses were performed according to a hierarchical testing plan.
Results
A total of 9971 participants were enrolled: 4984 were assigned to receive atorvastatin and 4987 to receive placebo. The mean (±SD) age of the participants was 74.7±4.5 years, and 51.9% were women. After a median of 5.9 years, a primary cardiovascular event had occurred in 297 participants (10.9 events per 1000 person-years) in the atorvastatin group and in 412 participants (15.5 events per 1000 person-years) in the placebo group (hazard ratio, 0.70; 95% confidence interval [CI], 0.61 to 0.82; P<0.001). Death from any cause, dementia, or persistent physical disability occurred in 637 participants (21.6 events per 1000 person-years) in the atorvastatin group and in 676 participants (23.0 events per 1000 person-years) in the placebo group (hazard ratio, 0.94; 95% CI, 0.84 to 1.05; P=0.25). Serious adverse events occurred in 131 participants (2.7%) in the atorvastatin group and in 129 (2.7%) in the placebo group, with musculoskeletal, hepatobiliary, and diabetes-related adverse events occurring more commonly in the atorvastatin group.
Conclusions
Treatment with atorvastatin led to a lower risk of major cardiovascular events than placebo at a median of 5.9 years but did not result in longer disability-free survival among community-dwelling older adults without clinical cardiovascular disease. (Funded by the National Health and Medical Research Council and others; STAREE ClinicalTrials.gov number, NCT02099123.)
