GSTM1 and atrial fibrillation: bGSH: reduced glutathione in blood; GSSG: glutathione disulfide (oxidized glutathione); RS GSH: redox status of glutathione (2·bGSH/GSSG); tGSH: total glutathione; tCys: total cysteine; tHcy: total homocysteine; tCG: total cysteinylglycine; SAM: S-adenosylmethionine; SAH: S-adenosylhomocysteine; Hb: hemoglobin; CAD: coronary artery disease; CABG: coronary artery bypass grafting; CPB: cardiopulmonary bypass; AF: atrial fibrillation; MI: myocardial infarction.