Note: All numeric data were reported as mean ± standard deviation. VAs = ventricular arrhythmias; mono represents monomorphic VAs; poly represents polymorphic VAs; EDVI = end-diastolic volume index; ESVI = end-systolic volume index; SVI = stroke volume index; CI = cardiac output index; LVEF = left ventricular ejection fraction; LVMI = left ventricular mass index.