Postoperative BNP-levels were also significantly higher than the preoperative ones in both groups (AF-group: 1032 pg/mL versus non-AF group: 705 pg/mL; P < 0.001), while there was a strong trend of more increased postoperative levels in AF- compared to the non-AF cases (P = 0.065). The gene discussed is NPPB; the disease is atrial fibrillation.