Low concentrations of three selected biomarkers in the blood of patients with atrial fibrillation identify patients with a high chance of attaining sinus rhythm. This is the main result of this analysis of the EAST – AFNET 4 biomolecule study. Today the findings have been presented by AFNET Steering Committee member Prof. Larissa Fabritz, University Medical Center Hamburg Eppendorf (UKE), Hamburg, Germany, at the annual congress of the European Society of Cardiology (ESC) in London and published in the European Heart Journal (1).