Prevalence of atrial fibrillation and its associated factors in Spain: An analysis of six population-based studies. DARIOS Study

Background and objectives Atrial fibrillation (AF) is the most common type of arrhythmia. The purpose of this study was to determine the prevalence of atrial fibrillation and its relationship with cardiovascular risk factors in Spain. Methodology Cross-sectional study based on a grouped analysis of 17,291 randomized individuals recruited in 6 population studies. Results The prevalence of atrial fibrillation was 1.5% (95% CI: 1.3–1.7%). Men had a greater prevalence of the disease than women (1.9 vs. 1.1%, respectively). The prevalence of atrial fibrillation progressively increased with age: 0.05% for patients younger than 45 years, 0.5% for those between 45 and 59 years of age, 2.3% for those between 60 and 74 years of age and 6.3% for those older than 75 years. The percentage of individuals who underwent anticoagulant treatment was 74.3%. The risk factors significantly associated with arrhythmia were ages older than 60 years (odds ratio [OR]: 7.6; 95% CI: 5.1–11.2), the male sex (OR: 1.8; 95% CI: 1.4–2.4), arterial hypertension (OR: 1.6; 95% CI: 1.2–2.1), obesity (OR: 1.5; 95% CI: 1.2–2.1) and a history of coronary artery disease (OR: 1.9; 95% CI: 1.3–3.0). Conclusion Atrial fibrillation is a common disease in elderly individuals, while its prevalence is low in individuals younger than 60 years. Most individuals with atrial fibrillation were on anticoagulant treatment. The risk factors for this type of arrhythmia are age, the male sex, hypertension, obesity and a history of coronary artery disease.