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有半数的心力衰竭病人因致命性室性心律失常事件死于心源性猝死。T波电交替是公认的预测心源性猝死的重要指标。早在许多年前就发现T波电交替与心源性猝死有关,近年来新建了频域和时域测量方法。跨室壁复极离散度异常增大是T波电交替的机制。最近研究发布的用微伏级T波电交替进行心肌梗死后危险性分层的初步结果否定心肌梗死后左室射血分数<30%的病人发生致死性快速室性心律失常的价值。但体内除颤器置入前T波电交替的对心源性猝死一级预防试验和非缺血性心肌病心力衰竭T波电交替的预测价值试验则强有力地支持T波电交替能预测心律失常。
Half of heart failure patients die of sudden cardiac death due to fatal ventricular arrhythmias. T wave alternation is recognized as an important indicator of sudden cardiac death. As early as many years ago, it was found that T wave alternation and sudden cardiac death related to new frequency and time domain measurements in recent years. Transmural repolarization dispersion anomaly increases abnormally is the mechanism of T wave alternation. A recent study published the preliminary result of risk stratification after myocardial infarction with microvolt T-wave alternation denied the value of lethal ventricular tachyarrhythmias in patients with left ventricular ejection fraction <30% after myocardial infarction. However, the predictive value of T defibrillator before T-wave alternation in the primary prevention of sudden cardiac death and non-ischemic cardiomyopathy alternating with T-wave are strong support for T-wave alternation prediction Arrhythmia.