NPPB and atrial fibrillation: The success rate of conversion using ibutilide was related to weight ((68.12 ± 11.72 vs. 72.83 ± 12.08) kg, P = 0.008),the duration of AF ((34.67 ± 55.68 vs. 66.52 ± 95.21) months, P = 0.008), the diameter of LA ((44.39 ± 5.80 vs. 47.36 ± 6.10) mm,P = 0.002), and N-terminal pro-brain natriuretic peptide (NT-proBNP) level ((854.85 ± 770.84 vs. 662.88 ± 659.18) pg/ml,P = 0.030).