Prognostic Importance of Atrial Fibrillation Timing and Pattern in Adults With Congestive Heart Failure: A Systematic Review and Meta-Analysis

Abstract Background Atrial fibrillation (AF) is common among adults with congestive heart failure (CHF). We conducted a meta-analysis to summarize the risk of mortality and cardiovascular disease associated with AF in CHF and stratified our analyses by AF timing and pattern. Methods We searched MEDLINE and EMBASE for observational studies examining the association of AF with cardiovascular disease and death. Eligible studies had a minimum of 50 participants with AF and 50 participants without AF, and a median follow-up of 6 months. Results Thirty-three studies involving 114,204 adults (43,549 with AF) were included in this meta-analysis. AF was associated with an increased risk of mortality and this risk varied between incident and prevalent AF (relative risk 2.21, 95% confidence interval 1.96–2.49 vs relative risk 1.19, 95% confidence interval 1.03–1.38, respectively; P Limitation Use of anticoagulation was infrequently reported in included studies. Conclusions AF was associated with an increased risk of cardiovascular disease and death and, notably, the risk of mortality varied by AF timing.