biostudies-literatureLehto MSydäntutkimussäätiöSigrid Jusélius FoundationYrjö Jahnssonin SäätiöHelsinki and Uusimaa Hospital District research fundAarne Koskelon Säätiöe002140https://www.ebi.ac.uk/biostudies/studies/S-EPMC9685262biostudies-literatureUnknown9(2)<h4>Objective</h4>Atrial fibrillation (AF) is a worldwide healthcare challenge owing to population ageing. In this study, we assessed the current trends in the incidence and prevalence of AF for the first time in an unselected, nationwide population.<h4>Methods</h4>In the Finnish Anticoagulation in Atrial Fibrillation study, we gathered comprehensive data including all primary, secondary and tertiary healthcare visits and drug reimbursement from national healthcare registers to identify all patients with incident AF between 2004 and 2018 in Finland. Incident AF was defined as new-onset AF occurring after 2007. Time trends for the incidence and prevalence of AF were calculated and stratified by sex and age.<h4>Results</h4>A total of 411 387 patients with AF diagnosis were documented in FinlOpen heartComprehensive nationwide incidence and prevalence trends of atrial fibrillation in Finland.PMC9685262TYH2019309Putaala JHaukka JHartikainen JKinnunen JLuojus AAiraksinen JKEHalminen OItainen-Stromberg SNiiranen JTiili PKouki ELehto MAro ALinna MFinACAF study groupMustonen PfalseComprehensive nationwide incidence and prevalence trends of atrial fibrillation in Finland.<h4>Objective</h4>Atrial fibrillation (AF) is a worldwide healthcare challenge owing to population ageing. In this study, we assessed the current trends in the incidence and prevalence of AF for the first time in an unselected, nationwide population.<h4>Methods</h4>In the Finnish Anticoagulation in Atrial Fibrillation study, we gathered comprehensive data including all primary, secondary and tertiary healthcare visits and drug reimbursement from national healthcare registers to identify all patients with incident AF between 2004 and 2018 in Finland. Incident AF was defined as new-onset AF occurring after 2007. Time trends for the incidence and prevalence of AF were calculated and stratified by sex and age.<h4>Results</h4>A total of 411 387 patients with AF diagnosis were documented in Finl2022-01-01T00:00:00Z2022 Nov2026-06-15T05:54:12.187Z2025-04-05T00:44:27.39ZS-EPMC96852623641433210.1136/openhrt-2022-002140