Incidence, type of atrial fibrillation and risk factors for stroke: a population-based cohort study
Authors Johansson C, Dahlqvist E, Andersson J, Jansson JH, Johansson L
Received 21 September 2016
Accepted for publication 21 November 2016
Published 24 January 2017 Volume 2017:9 Pages 53—62
Checked for plagiarism Yes
Review by Single-blind
Peer reviewers approved by Dr Amy Norman
Peer reviewer comments 2
Editor who approved publication: Professor Henrik Toft Sørensen
Cecilia Johansson, Erik Dahlqvist, Jonas Andersson, Jan-Håkan Jansson, Lars Johansson
Department of Public Health and Clinical Medicine, Skellefteå Research Unit, Umeå University, Umeå, Västerbotten, Sweden
Purpose: The aims of this study were to estimate the incidence of atrial fibrillation and atrial flutter (AF), to assess the presence of provoking factors and risk factors for stroke and systemic embolism, and to determine the type of AF in patients with first-diagnosed AF.
Patients and methods: This cohort study was performed in northern Sweden between January 1, 2011 and December 31, 2012. Diagnosis registries were searched for the International Classification of Diseases-10 code for AF (I48) to identify cases of incident AF. All AF diagnoses were electrocardiogram-verified. Data pertaining to provoking factors, type of AF and presence of risk factors for stroke and systemic embolism according to the CHA2DS2-VASc score were obtained from medical records.
Results: The incidence of AF in the entire population was 4.0 per 1,000 person-years. The incidence was 27.5 per 1,000 person-years in patients aged ≥80 years. A total of 21% of all patients had a provoking factor in association with the first-diagnosed episode of AF. The CHA2DS2-VASc score was 2 or higher in 81% of the patients. Permanent AF was the most common type of AF (29%).
Conclusion: There was a considerable increase in the incidence of AF with age, and a provoking factor was found in one-fifth. The most common type of AF was permanent AF. Four in five patients had a CHA2DS2-VASc score of 2 or more.
Keywords: atrial fibrillation, atrial flutter, incidence, risk factors for stroke
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