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Incidence, type of atrial fibrillation and risk factors for stroke: a population-based cohort study

Cecilia Johansson1, Erik Dahlqvist1, Jonas Andersson1

  • 1Department of Public Health and Clinical Medicine, Skellefteå Research Unit, Umeå University, Umeå, Västerbotten, Sweden.

Clinical Epidemiology
|February 10, 2017
PubMed

Insights

The incidence of atrial fibrillation (AF) increases significantly with age. Most patients diagnosed with AF have risk factors for stroke and permanent AF is the most common type.

Area of Science:

  • Cardiology
  • Epidemiology
  • Public Health

Background:

  • Atrial fibrillation and atrial flutter (AF) are common arrhythmias.
  • Understanding AF incidence, risk factors, and types is crucial for patient management and stroke prevention.

Purpose of the Study:

  • To estimate the incidence of atrial fibrillation and atrial flutter (AF).
  • To assess provoking and risk factors for stroke and systemic embolism in new AF cases.
  • To determine the predominant type of AF among newly diagnosed patients.

Main Methods:

  • A cohort study conducted in northern Sweden (2011-2012).
  • Incident AF cases identified via ICD-10 code (I48) and electrocardiogram-verified.
  • Data on provoking factors, AF type, and CHA2DS2-VASc scores extracted from medical records.

Main Results:

  • Overall AF incidence was 4.0 per 1,000 person-years, rising to 27.5 in those ≥80 years.
  • A provoking factor was identified in 21% of patients with first-diagnosed AF.
  • Permanent AF was the most frequent type (29%), and 81% had a CHA2DS2-VASc score ≥2.

Conclusions:

  • AF incidence markedly increases with age, with significant stroke risk factors present in most patients.
  • Permanent AF is the most common type, highlighting the need for proactive stroke prevention strategies.
Abstract

Keywords:
atrial fibrillationatrial flutterincidencerisk factors for stroke

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