It's also important to obtain an electrocardiogram, which typically shows a prolonged QT interval, appearance of a U wave, and atrial or ventricular tachyarrhythmias.

心电图也很重要，典型表现出长QT间期，出现U波，以及房速或室速性心律失常。

These include flattening or inversion of T wave, increasingly prominent U wave, ST segment depression and prolonged QT interval.

其中包括T波变平或倒置，U波逐渐突出，ST段压低，QT间期延长。