NPPB and atrial fibrillation: After assessment in the univariate model, leukocyte indices were tested after adjustment parameters which demonstrated significant association in univariate Cox regression (i.e., sex, NYHA functional class, levels of NT-proBNP, the eGFR, C-reactive protein, history of both atrial fibrillation or diabetes mellitus, systolic pulmonary artery pressure, and left ventricular global longitudinal strain).