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

长QTs患者发生尖端扭转心律失常（一种潜在的致命心律失常）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.

心电能会发生变化，例如QT延长、ST段延长，还有心律失常，比如尖端扭转和房颤。

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’能会增加由去极化后引起的尖端扭转型速的风。

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，这类药物能会导致心率不齐，因为极化速率减慢，会延长QT间期，增加尖端扭转型速的风。