Low‐dose aspirin for prevention of cardiovascular mortality in patients with type 2 diabetes and chronic kidney disease: A real‐world nationwide cohort study

AIMS/INTRODUCTION: Cardiovascular mortality risk is elevated among patients with diabetes and concurrent chronic kidney disease. However, controversy surrounds the use of aspirin for primary prevention within this population. This study aims to assess the effectiveness and safety of low-dose aspirin for primary prevention in patients with diabetes and pre-end-stage renal disease. MATERIALS AND METHODS: This was a retrospective population-based cohort study using the National Health Insurance Research Database in Taiwan. The study included adults with type 2 diabetes who were enrolled in the pre-end-stage renal disease pay-for-performance program and had no atherosclerotic cardiovascular disease. We used propensity score analysis to control baseline characteristics between the two groups. Clinical outcomes including cardiovascular mortality, all-cause mortality, major bleeding, and renal disease progression were compared between patients who first received aspirin and those who did not. RESULTS: Between January 2012 and December 2015, a total of 2,155 low-dose aspirin users and 6,737 nonaspirin users were identified. Following propensity score adjustment, aspirin use exhibited a comparable risk of cardiovascular death compared with nonaspirin users (adjusted hazard ratio [aHR] 1.12; 95% confidence interval [CI] 0.65-1.95; P = 0.681). The risk of all-cause mortality was similar between the two groups (aHR 1.07; 95% CI 0.92-1.24; P = 0.385). Similar risks were observed in terms of major bleeding and renal disease progression. CONCLUSIONS: In patients with diabetes and pre-end-stage renal disease who lacked atherosclerotic cardiovascular disease, low-dose aspirin did not demonstrate a reduction in mortality. These findings do not support the use of aspirin for primary prevention in this high-risk population.