NPPB and atrial fibrillation: Significant differences were observed between the non-AF recurrence and recurrence groups in TC, ALB, and NT-pro BNP: [4.7 (4.7–4.8) mmol/L vs. 4.3 (4.3–4.4) mmol/L, P <  0.001], [42.9 (40.6–43.8) g/L vs. 40.5 (39.7–41.1) g/L, P <  0.001], and [485.4 ±  254.1 pg/mL vs. 999.3 ±  270.2 pg/mL, P <  0.001], respectively.