NPPB and atrial fibrillation: These included: the duration of AF-related symptoms (<24 h; 2 points), a lack of prior cardioversion history (2 points), heart rate at admission (>125 beats per minute; 1 point), potassium replacement at K + level ≤ 3.9 mmol/L (1 point), NTproBNP (<1300 pg/mL; 1 point) and lactate dehydrogenase level (<200 U/L; 1 point).