NPPB and atrial fibrillation: The AF Group exhibited significantly elevated levels of D-dimer (2.8 ± 3.6 μg/ml vs. 1.3 ± 1.7 μg/ml, P = 0.001) and BNP (143.3 ± 217.3 pg/ml vs. 38.4 ± 67.4 pg/ml, P < 0.001).