Patients with long QTs are at an increased risk of torsade de pointe, a potentially fatal ventricular arrhythmia.

长QTs患者发生尖性室性失常（一种潜在的致命性室性失常）的风增加。

Also an electrocardiogram might have changes such as a prolonged QT, prolonged ST segment, and arrhythmias, like torsade de pointes and atrial fibrillation.

电图也可能会发生变化，例如QT延长、ST段延长，还有失常，比如尖和房颤。

But prolonged repolarization z' may increase the risk of torsades de point a type of tachycardia caused by after depolarizations.

但是延长了的复极化 z’可能会增加由去极化后引起的尖型室速的风。

However these drugs may also cause arrhythmias, because slowly polarizations are associated with longer QT intervals and increased risk of torsades de pointes.

不过，这类药物也可能会导致率不齐，因为极化速率减慢，会延长QT间期，增加尖型室速的风。