Early Rhythm-Control Therapy in Patients with Atrial Fibrillation

P. Kirchhof, A.J. Camm, A. Goette, A. Brandes, L. Eckardt, A. Elvan, T. Fetsch, I.C. van Gelder, D. Haase, L.M. Haegeli, F. Hamann, H. Heidbüchel, G. Hindricks, J. Kautzner, K.-H. Kuck, L. Mont, G.A. Ng, J. Rekosz, N. Schoen, U. Schotten, A. Suling, J. Taggeselle, S. Themistoclakis, E. Vettorazzi, P. Vardas, K. Wegscheider, S. Willems, H.J.G.M. Crijns, and G. Breithardt, for the EAST-AFNET 4 Trial Investigators*

n engl j med 383;14 nejm.org October 1, 2020

Abstract

BACKGROUND
Despite improvements in the management of atrial fibrillation, patients with this
condition remain at increased risk for cardiovascular complications. It is unclear whether early rhythm-control therapy can reduce this risk.


METHODS
In this international, investigator-initiated, parallel-group, open, blinded outcome assessment trial, we randomly assigned patients who had early atrial fibrillation
(diagnosed ≤1 year before enrollment) and cardiovascular conditions to receive
either early rhythm control or usual care. Early rhythm control included treatment
with anti-arrhythmic drugs or atrial fibrillation ablation after randomization.
Usual care limited rhythm control to the management of atrial fibrillation–related
symptoms. The first primary outcome was a composite of death from cardiovascular
causes, stroke, or hospitalization with worsening of heart failure or acute coronary syndrome; the second primary outcome was the number of nights spent in the hospital per year. The primary safety outcome was a composite of death, stroke, or serious adverse events related to rhythm-control therapy. Secondary outcomes, including symptoms and left ventricular function, were also evaluated.


RESULTS
In 135 centers, 2789 patients with early atrial fibrillation (median time since diagnosis,
36 days) underwent randomization. The trial was stopped for efficacy at the third interim analysis after a median of 5.1 years of follow-up per patient. A first-primary-outcome event occurred in 249 of the patients assigned to early rhythm control (3.9 per 100 person-years) and in 316 patients assigned to usual care (5.0 per 100 person-years) (hazard ratio, 0.79; 96% confidence interval, 0.66 to 0.94; P = 0.005). The mean (±SD) number of nights spent in the hospital did not differ significantly between the groups (5.8±21.9 and 5.1±15.5 days per year, respectively; P = 0.23). The percentage of patients with a primary safety outcome
event did not differ significantly between the groups; serious adverse events related to rhythm-control therapy occurred in 4.9% of the patients assigned to early rhythm control and 1.4% of the patients assigned to usual care. Symptoms and left ventricular function at 2 years did not differ significantly between the groups.


CONCLUSIONS
Early rhythm-control therapy was associated with a lower risk of adverse cardiovascular
outcomes than usual care among patients with early atrial fibrillation and
cardiovascular conditions. (Funded by the German Ministry of Education and
Research and others; EAST-AFNET 4 ISRCTN number, ISRCTN04708680; Clinical-
Trials.gov number, NCT01288352; EudraCT number, 2010 – 021258 – 20.)

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