NPPB and atrial fibrillation: Regrettably, our study encountered limitations due to missing data and its small sample size, precluding a direct comparison of the diagnostic potential of the studied miRNAs with that of Tn I. Furthermore, Sieweke et al. found that miRNA-21 and NT-proBNP correlated with echocardiographic parameters and could predict atrial fibrillation [57].