We investigated the association of B-lines with indices of hemodynamic congestion [BNP, E/e’, pulmonary systolic arterial pressure (PAPs)] in HF patients, and their prognostic value overall and according to concomitant atrial fibrillation (AF), reduced (≤40%) ejection fraction (EF), and timing of quantification during hospitalisation for heart failure (HHF). This evidence concerns the gene NPPB and atrial fibrillation.