Guinand Alexandre, Namdar Mehdi, Burri Haran, Shah Dipen
Rev Med Suisse. 2016 May 25;12(520):1049-53.
The QT interval is the most widely used ECG parameter for the assessement of myocardial repolarization and the risk of torsades de pointes. Measured from the beginning of the QRS complex, it is also influenced by the duration of the depolarization phase. The presence of ventricular conduction abnormalities or a widening of the QRS during ventricular pacing prolongs the QT interval, even if the repolarization phase is normal. Consequently, it is difficult to assess the QT interval in this population and to estimate the risk of torsades de pointes. In this article, we would like to give an overview of the current literature as guidance to the measurement of the QT interval in the presence of a QRS widening.
QT间期是评估心肌复极和尖端扭转型室速风险时应用最广泛的心电图参数。它从QRS波群起始处开始测量，也受去极化期时长的影响。存在心室传导异常或心室起搏时QRS波增宽会延长QT间期，即便复极期正常。因此，在这类人群中评估QT间期并估计尖端扭转型室速风险很困难。在本文中，我们将概述当前文献，为存在QRS波增宽时QT间期的测量提供指导。
