Objective To evaluate the clinical significance of QT dis persion (QTd, QTcd) in dilated cardiomyopathy (DCM). Methods QTd and QTcd were measured on simultaneously recording 12-lead electrocardiograms ( ECGs) in 60 DCM patients and cormpared with 60 healthy subjects. Results The values of QTd and QTcd in DCM were significantly higher than those in control group ( P ＜ 0. 01 ). With subgroup analysis, QTd and QTcd in patients uith cardiac sudden death (CSD) were longer than those in survivors and those died of progressive heart failure ( P ＜ 0. 05), patients with ventricular tachycardia (VT) or with severe heart failure than those without (compared uith patients with ventricular premature beats [V PB], P＜0.05, compared with patients without ventricular arrhythmia [VA], P＜0. 01) or with mild heart failure (P＜0. 01). The values of QTd and QTcd in patients with VPB were greater than those in patients without VA( P＜ 0. 05). There were significant differences in the rates of VT, CSD and heart failure between

来源：南京医科大学学报(自然科学版) 2000 年 14卷 2期