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QT离散度（QTd）系体表12导联心电图各导联间QT问期之差异。即QTmax－QTmin，是评价心室复极时间差异性的无削而有价值的手段。急性心肌梗塞（AMI）后缺血区域内心肌不应期差别增大，心室复极时间不均匀性增加。本文目的在于探讨AMI早期QTd的变化及有效的溶栓治疗对QTd的作用。
QT Dispersion (QTd) Table 12 Differences in QT between lead ECG leads. Namely QTmax-QTmin, is a non-tweakable and valuable means of evaluating the variability of ventricular repolarization time. Acute myocardial infarction (AMI) ischemic area within the myocardial refractory period increased, ventricular repolarization uneven time increased. The purpose of this paper is to explore the early QTd AMI changes and effective thrombolytic therapy on QTd.