Early recognition and treatment for early warning electrocardiogram (ECG) of sudden death are very important to prevent and treat malignant arrhythmia and sudden death. Previous studies have found that R-on-T and T wave alternation, and QT interval prolongation are closely related to malignant arrhythmia or sudden death, which are included in the critical value of ECG.By analyzing the ECG characteristics of 4 patients with sudden death, we found that although the causes of the patients were different, there were transient prolongation of QT interval after premature contraction in 12 lead ECG, followed by malignant arrhythmia or sudden death. Thus, we thought that the transient prolongation of QT interval after premature contraction had a high value for warning malignant arrhythmia or sudden death. This phenomenon should be paid enough attention to reduce the risk of sudden death.
猝死预警心电图的早期识别与处理对防治恶性心律失常、猝死至关重要。已有研究发现：R-on-T和T波电交替、QT间期延长等均与恶性心律失常及猝死密切相关，且被列入心电图的危急值。笔者分析4例猝死患者的心电图特征，发现尽管其病因不尽相同，但12导联心电图中均出现了期前收缩后短暂的QT间期延长，最终患者都发生了恶性心律失常或猝死。因此，期前收缩后短暂的QT间期延长对恶性心律失常或猝死有很高的预警价值，应当高度重视，以减少患者猝死的风险。.
Keywords: premature contraction; prolonged QT interval; sudden death; warning electrocardiogram.