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目的:观察QTc间期在心肌急性缺血发作时变化特点,探讨其在急性心肌梗死心电图诊断中的价值。方法:回顾性分析3例心电图出现QT间期变化的急性心肌梗死患者的心电图,观察缺血发作时与缓解(静息)时心电图QT间期、RR间期以及QTc间期的变化特点。QTc间期按Bazetts公式计算。结果:3例患者出现缺血性QTc间期改变,其中2例表现为QTc间期延长,1例QTc间期缩短。在QT间期改变中以ST段、T波时限改变为主,QRS波时限未变化,伴T波振幅绝对值增大,ST段可抬高、压低或不变。结论:缺血性QTc间期异常可能是急性心肌梗死超急期的心电图特征之一。
OBJECTIVE: To observe the changes of QTc interval during the onset of acute myocardial ischemia, and to explore its value in the diagnosis of acute myocardial infarction. Methods: The electrocardiogram of 3 patients with acute myocardial infarction with QT interval changes were retrospectively analyzed. The changes of ECG QT interval, RR interval and QTc interval were observed during ischemic attack and remission (resting). QTc interval according to Bazetts formula. Results: Three patients had ischemic changes of QTc interval. Two of them showed QTc interval prolongation and one QTc interval shortening. In the QT interval changes in the ST segment, T-wave time-based change, QRS wave duration did not change, with the absolute value of T-wave amplitude increased, ST segment can be elevated, depressed or unchanged. CONCLUSION: Ischemic QTc interval abnormality may be one of the ECG characteristics of acute-myocardial infarction hyperacute.