Background and objective: We aimed to assess the prevalence of atrial fibrillation (AF) in a general heart failure (HF) population admitted to a HF unit, analyze the parameters associated with AF, and evaluate its prognostic significance.
Patients and method: 389 patients, 64 with AF at the first visit. Mean (SD) age was 65.38 (10.77) years and 72.5% were men. The main etiology was ischemic heart disease (59.9%). Mean ejection fraction (EF) was 32.25% (13%). Vital status at 2 years was available in 377 patients (97%), 314 in sinus rhythm (SR) and 63 in AF.
Results: The prevalence of AF was 15.8%. AF was associated with: older age, female gender, valvular and hypertensive etiology, longer time since the onset of HF symptoms, higher EF, higher left atrium diameter, degree of mitral regurgitation, and lower quality of life, but not with the NYHA functional class. The 2-years mortality (16.7%) was significantly higher in patients with AF (33.3% vs 18.4%; OR = 2.20; 95% confidence interval, 1.21-4). However, when adjusted for other relevant variables such as age, NYHA functional class, ejection fraction, sex and etiology, AF did not remain as an independent prognostic factor. The strongest mortality differences between patients with AF and those with SR where observed in ischemic heart disease and dilated cardiomyopathy.
Conclusions: AF was associated mainly with age, valvular and hypertensive etiology, higher left atrium diameter and lower end-systolic left ventricular diameter. Two years mortality was significantly higher in patients with AF, although other parameters such as age and NYHA functional class had a higher prognostic value.