More specifically, MR-proANP levels were higher in patients with AF episodes lasting longer than 48 hours compared to patients with episodes of less than 48 hours duration (321.7 IQR 236.4–425.6 versus 144.0 IQR 129.2–213.7 [pmol/L].[7] In our study, patients with elevated lnMR-proANP levels had 5.03-fold greater odds of having newly-diagnosed atrial fibrillation. This evidence concerns the gene NPPA and atrial fibrillation.