GSTM1 and Arrhythmia: No significant differences were found in the overall gender, weight, body mass index (BMI), medication use, underlying disease history (hypertension, coronary artery disease, arrhythmia, heart valve disease, and diabetes mellitus), smoking history, laboratory tests (including Hb, TG, LDL-C, Hcy, K+, Na+, Cl−, and Mg2+), and echocardiographic indices, LVEF and calculated LVMI, between the two groups (P > 0.05).