Physicians' Academy for Cardiovascular Education

Paroxysmal AF associated with worse clinical outcomes than persistent AF

Paroxysmal atrial fibrillation is associated with worse clinical outcomes than persistent/ permanent atrial fibrillation in patients with heart failure and reduced ejection fraction

Presented at ACC.17 by JJV McMurray

Mar. 23, 2017 - news

Background

Whether AF is an independent prognostic factor in HFrEF is disputed. In relevant clinical studies, AF was inconsistently defined, with some using medical history and others using the baseline ECG to identify AF. Moreover, the outcomes have not been related to the type of AF at baseline (paroxysmal vs. persistent/permanent), and the relationship between incident AF and outcomes has barely been assessed. Also, adjustment of outcomes has varied between studies. On top of that, the most powerful independent predictor of outcomes, the measurement of natriuretic peptides, has not been included in chronic HFrEF studies.

In this study, the association between AF and the risk of CV events was evaluated according to AF status at randomisation, in a pooled analysis of the PARADIGM-HF and the ATMOSPHERE databases, the 2 largest global multicentre, randomised trials in HFrEF patients. The trials had an almost identical design and detailed clinical data, plasma NTproBNP and a 12 lead ECG were recorded/measured at baseline. Investigators asked about history of AF (and if yes, whether the AF was paroxysmal or persistent/permanent), and whether or not the baseline ECG showed AF. The primary outcome of both trials was a composite of CV death or HF hospitalisation.

Main results

Conclusion

Paroxysmal, but not persistent/permanent AF, was associated with a higher risk of the composite outcome of HF hospitalisation or CV death, even after adjustment for other prognostic variables, including NT proBNP. This finding was driven by an elevated risk of HF hospitalisation. Paroxysmal AF was also associated with a higher adjusted risk of stroke, but persistent/permanent AF was not. New-onset AF conferred the greatest risk of all, since it was associated with a higher risk of HF hospitalisation, death and stroke. These data suggest that new-onset AF should prompt immediate consideration of anticoagulant therapy.

Disclosures

Our coverage of ACC.17 is based on the information provided during the congress.