Persistent atrial fibrillation is associated with appropriate shocks and heart failure in patients with left ventricular dysfunction treated with an implantable cardioverter defibrillator

Aim The objective of this study was to investigate whether persistent atrial fibrillation (AF) and new-onset AF are associated with appropriate shocks, cardiovascular mortality, chronic heart failure (CHF), and inappropriate shocks in implantable cardioverter defibrillator (ICD) patients with left ventricular dysfunction. Methods We included 290 consecutive ICD patients with a documented left ventricular ejection fraction ≤0.35 and compared outcomes between patients without AF (n = 207), those with persistent AF (n = 64), and those with new-onset AF (n = 19). Results The patients with persistent AF were older, more frequently had valve disease and cardiac surgery, and less frequently had coronary artery disease as compared with the patients without AF. Patients with persistent AF had a higher New York Heart Association class, however, left ventricular ejection fraction rates between these 2 groups were comparable (0.28 ± 0.07 vs 0.29 ± 0.08, P = not significant). No difference was found between patients with new-onset AF and those without AF. During follow-up (2.6 ± 1.9 years), more patients with persistent AF received appropriate ICD shocks as compared with those without AF (24 [38%] vs 49 [24%], P = .04). Deterioration of CHF occurred more often in patients with persistent AF (19 [30%], P = .001) and those with new-onset AF (9 [47%], P < .001) as compared with patients without AF (31 [14%]). Multivariate analysis revealed that patients with persistent AF had an increased risk for appropriate ICD shocks (adjusted hazard ratio [HR] 1.9, 95% CI 1.2-3.2, P = .009). Persistent AF (adjusted HR 2.1, 95% CI 1.1-3.9, P = .03) and new-onset AF (adjusted HR 2.5, 95% CI 1.1-5.7, P = .02) were found to be independent risk indicators of CHF deterioration. Conclusions In ICD patients with left ventricular dysfunction, persistent AF is associated with appropriate ICD shocks and deterioration of CHF. New-onset AF is related to deterioration of CHF.