NPPB and atrial fibrillation: Findings from the meta-analysis related to the relationship between plasmaBNP/NT-proBNP level and AF recurrence after successful electrical cardioversionin patients with AF are shown in Figure 2.When data were pooled across studies, the baseline BNP/NT-proBNP levels in theAF recurrence group were significantly higher than those in the SR-maintaininggroup (SMD -0.70, CI [-0.82, -0.58]).