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Type 2 diabetes increases the long‐term risk of heart failure and mortality in patients with atrial fibrillation

Impact of type 2 diabetes mellitus (T2DM) on non‐thromboembolic outcomes in atrial fibrillation (AF) is insufficiently explored. This prospective cohort study of AF patients aimed (i) to analyse the association between T2DM and heart failure (HF) events (including new‐onset HF), and all‐cause and cardiovascular mortality, (ii) to assess the impact of baseline T2DM treatment on outcomes, and (iii) to explore characteristics of new‐onset HF phenotypes in relation to T2DM status.