What condition is associated with polymorphic ventricular tachycardia due to a prolonged QT interval?

Torsades de pointes is a specific type of polymorphic ventricular tachycardia that is closely associated with a prolonged QT interval. This condition is characterized by a distinct pattern on an electrocardiogram (ECG), where the QRS complexes appear to twist around the baseline. Prolonged QT interval can result from various factors, including genetic predispositions, electrolyte imbalances, or the effects of certain medications.

In the case of torsades de pointes, the prolonged QT interval creates an environment that can lead to abnormal electrical activity in the heart, resulting in this dangerous arrhythmia. It is especially notable for its potential to progress to more serious ventricular arrhythmias such as ventricular fibrillation.

Other conditions listed in the choices do not directly relate to polymorphic ventricular tachycardia due to a prolonged QT interval, making torsades de pointes the only correct answer in this context.