612 EVOLUTION OF ATRIAL FIBRILLATION PATTERNS AND IMPACT ON ALL-CAUSE MORTALITY IN A CONTEMPORARY COHORT OF EUROPEAN PATIENTS WITH ATRIAL FIBRILLATION

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Abstract Background Paroxysmal atrial fibrillation (AF) often shows a natural evolution towards more sustained forms of the arrhythmia. Real-world data on clinical factors associated with AF progression and its impact on long-term outcomes are limited. Aim of the study To investigate the factors associated with progression of AF and its impact on all-cause mortality in a contemporary cohort of European AF patients. Methods We analyzed patients enrolled in the ESC-EHRA EORP-AF General Long-Term Registry. Patients with paroxysmal AF at baseline or first detected AF who underwent successful cardioversion were included. Patients with known rhythm status at 1-year were then stratified into two groups: (i) No AF progression and (ii) AF progression, (as defined by transition to persistent or permanent AF). All-cause mortality at 2-year of follow-up was the primary outcome of the analysis. Results A total of 2688 patients were included (median age 67 years, interquartile range [IQR] 60-75, females 44.7%, CHA2DS2VASc score median 3 [1-4], HASBLED median 1 [1-2]). After 1-year of follow-up 2094 (77.9%) patients showed no AF progression while 594 (22.1%) developed AF progression. On multivariable logistic regression analysis, no physical activity (odds ratio [OR] 1.35, 95% confidence interval [CI] 1.02-1.78), valvular heart disease (OR 1.63, 95%CI 1.23-2.15), left atrium diameter (OR 1.03, 95% CI 1.01-1.05) and left ventricular ejection fraction (OR 0.98, 95% CI 0.97-1.00) were independently associated with AF progression at 1-year. At the end of 2-year of follow-up, death occurred in 80/2621 (3.1%) patients. Kaplan-Meier analysis showed a lower cumulative survival from all-cause mortality in patients with AF progression compared to non-progression AF patients (Log Rank p=0.01, Figure). On multivariable Cox regression analysis, adjusted for age, sex, heart failure, coronary artery disease, hypertension, diabetes mellitus, previous thromboembolic events, peripheral artery disease, chronic kidney disease and use of oral anticoagulants, patients with AF progression had an independently higher risk for all-cause mortality (adjusted hazard ratio [aHR] 1.77, 95%CI 1.09-2.89). Conclusions In a contemporary cohort of European AF patients, a substantial number of patients evolved to persistent/permanent AF within 1 year. Clinical factors related to atrial structural remodeling were independently associated with arrhythmia evolution. AF progression was associated with an increased risk of all-cause mortality.