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目的：研究急性心肌梗塞（AMI）入院时、住院1周及4周时QTc离散度（QTcd）与早期定性心律失常的关系。方法：分别测量55例AMI入院时、住院1周及4周时12导联心电图的QTcd，同时测量20例键康者的QTcd。结果；AMI早期QTcd显著增加（P＜0.01），三周及4周明显下降（P＜0.01）；AMI早期发生室性心律失常者QTcd较无心律失常者显著增加（P＜0．01）。结论：AMI早期测量QTcd可了解发生室性心律失常的可能性，以针对性防治。
OBJECTIVE: To study the relationship between QTc Dispersion (QTcd) and early-onset qualitative arrhythmias at 1 week and 4 weeks of hospital admission for acute myocardial infarction (AMI). Methods: The QTcd of 12-lead electrocardiogram was measured in 55 cases of AMI admission, 1 week and 4 weeks of hospitalization respectively, and QTcd of 20 cases of Jiankang were measured. Results QTcd in early AMI increased significantly (P <0.01), and decreased significantly in three weeks and four weeks (P <0.01). QTcd in AMI patients with ventricular arrhythmia was significantly higher than that without arrhythmia (P <0.01). Conclusion: The early measurement of QTcd in AMI can understand the possibility of occurrence of ventricular arrhythmia, with targeted control.