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，QT长、ST段长，还有律失常，比尖端扭转和房颤。

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

长QTs患者发生尖端扭转室律失常（一种潜在的室律失常）的风险增加。

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

但是长了的复极化 z’可能会增加由去极化后引起的尖端扭转型室速的风险。

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率不齐，因为极化速率减慢，会长QT间期，增加尖端扭转型室速的风险。