NPPB and atrial fibrillation: There were no differences in clinical characteristics, except serum levels of N-Terminal Pro-B-Type Natriuretic Peptide (NT-pro-BNP) were higher in AF compared to SR [1,916 pg/ml (IQR: 1,029–3,117) vs. 775 pg/ml (IQR: 257–2,057), p < 0.001].