EDN1 and atrial fibrillation: = Angiotensin-converting enzyme= Activated clotting time= Asymmetric dimethylarginine= Atrial fibrillation= Analysis of variance= Body mass index= Coronary artery bypass grafting= Cold blood cardioplegia= Chronic obstructive pulmonary disease= Cardiopulmonary bypass= Diabetes mellitus= Endothelium-derived hyperpolarizing factor= Enzyme-linked immunosorbent assay= Endothelin-1