Cardiovascular events and mortality in people with and without type 2 diabetes: An observational study in a contemporary multi‐ethnic population

Aims/Introduction The aim of this study was to examine ethnicity‐specific associations between type 2 diabetes mellitus and the risk of a cardiovascular disease (CVD) event as well as risk of specific CVD phenotypes in England. Methods We obtained data from the Clinical Practice Research Datalink for adults with and without type 2 diabetes mellitus diagnosed 2000–2006. The outcome was the first CVD event during 2007–2017 and the following components: aortic aneurysm, cerebrovascular accidents, heart failure, myocardial infarction, peripheral vascular disease and other CVD‐related conditions. Flexible parametric survival models were used to estimate ethnicity‐specific adjusted hazard ratios. Results A total of 734,543 people with and without type 2 diabetes mellitus (29,847; 4.1%) were included; most were of white ethnicity (93.0% with and 92.3% without type 2 diabetes mellitus) followed by South Asian (3.2 and 4.6%). During a median follow‐up period of 11.0 years, 67,218 events occurred (6,156 in individuals with type 2 diabetes mellitus). Type 2 diabetes mellitus was associated with a small increase in CVD events (adjusted hazard ratio 1.06, 95% confidence interval 1.02–1.09) in individuals of white ethnicity; whereas the adjusted hazard ratios were considerably higher in individuals of South Asian ethnicity (1.28, 95% confidence interval 1.09–1.51), primarily due to an increased risk of myocardial infarction (1.53, 95% confidence interval 1.08–2.18). Conclusions Despite universal access to healthcare, there are large disparities in CVD outcomes in people with and without type 2 diabetes mellitus. Other non‐traditional risk factors might play a role in the higher CVD risk associated with type 2 diabetes mellitus in individuals of South Asian ethnicity.
Despite universal access to healthcare, there are large ethnic disparities in cardiovascular disease outcomes in people with and without type 2 diabetes mellitus. Type 2 diabetes mellitus was associated with a small increase in cardiovascular disease events (adjusted hazard ratio 1.06, 95% confidence interval 1.02–1.09) in individuals of white ethnicity; whereas the adjusted hazard ratio was considerably higher in individuals of South Asian ethnicity (1.28, 95% confidence interval 1.09–1.51), primarily due to an increased risk of myocardial infarction (adjusted hazard ratio 1.53, 95% confidence interval 1.08–2.18).