NPPB and atrial fibrillation: According to multivariate Cox regression analysis, preoperative UA (P = 0.006), BNP (P = 0.042), high-sensitivity CRP (P = 0.026), ESR (P = 0.026) =0.016), LAD (P = 0.031), MVG (P = 0.009), and LAMD (P = 0.044) were significantly associated with atrial fibrillation recurrence after radiofrequency ablation in patients with non-isolated atrial fibrillation.