Results. For patients with type 2 diabetes, the risk of ASCVD (a composite of coronary heart disease and stroke) was lower among those who took statins than among those who did not in the 75-to-84 group (hazard ratio [HR] = 0.76; 95% confidence interval [CI], 0.65-0.89; 1-year number needed to treat [NNT] = 164). Among those who took statins, there was also lower all-cause mortality (HR = 0.84; 95% CI, 0.75-0.94; 1-year NNT = 306). In those ages ≥ 85 years with diabetes, the statin group did not have a lower risk of ASCVD (HR = 0.82; 95% CI, 0.53-1.26) or all-cause mortality (HR = 1.05; 95% CI, 0.86-1.28).
For patients ages 75 to 84 years without diabetes, there was no difference in risk between groups for ASCVD (HR = 0.94; 95% CI, 0.86–1.04) or all-cause mortality (HR = 0.98; 95% CI, 0.91-1.05). In those ages ≥ 85 years without diabetes, there was also no difference between groups for ASCVD (HR = 1; 95% CI, 0.80-1.24) or for all-cause mortality (HR = 1; 95% CI, 0.90-1.11).
A 2019 meta-analysis of randomized controlled trials (RCTs) (n = 134,537) and RCT summary data (n = 12,705) evaluated the safety and efficacy of statin therapy in patients ages ≥ 55 years.2 In the group of patients ages > 75 years (n = 14,483; median follow-up, 4.9 years), each 1 mmol/L reduction in LDL-C was associated with significant decreased risk for major vascular events (risk ratio [RR] = 0.82; 95% CI, 0.70-0.95) and for major coronary events (RR = 0.82; 95% CI, 0.70-0.96).
In subgroup analysis by the presence or absence of previous vascular disease, there was a decreased risk per 1 mmol/L LDL-C reduction of major vascular events in patients with previous vascular disease (RR = 0.85; 95% CI, 0.73-0.98); however, there was not a significant effect in patients without previous vascular disease (RR = 0.92; 95% CI, 0.73-1.16).
WHAT’S NEW
Statins may be unnecessary in older adults without ASCVD or T2DM
Statin therapy reduces the risk of ASCVD and mortality in patients ages 75 to 84 with type 2 diabetes and in patients > 75 years with known vascular disease. However, statin therapy seems to provide no benefit in patients ages > 75 years without ASCVD or in patients ages ≥ 85 years without ASCVD, regardless of type 2 diabetes status.
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