NPPB and atrial fibrillation: In the univariate Cox proportional hazards regression analyses, only ln BNP was significantly associated with the recurrence of AF (unadjusted HR = 1.353, 96% CI = 1.068–1.713, P = 0.012), whereas use of β-blocker, use of loop diuretics, and ln sTM were not significantly associated with the recurrence of AF (unadjusted HR = 1.582, 96% CI = 0.968–2.585, P = 0.067; unadjusted HR = 1.603, 96% CI = 0.873–2.945, P = 0.128; unadjusted HR = 0.447, 96% CI = 0.180–1.107, P = 0.082, respectively) as shown in Table 2.