What is often a consequence of prolonged QT syndrome?

Prolonged QT syndrome is characterized by an extended duration of the QT interval on an electrocardiogram (ECG), which represents the time taken for the heart's ventricles to depolarize and repolarize. One of the well-known and serious consequences of prolonged QT syndrome is Torsades de Pointes (TdP), a specific type of ventricular tachycardia.

Torsades de Pointes occurs when there is a disruption in the normal electrical activity of the heart, leading to a rapid and irregular heartbeat. The prolonged QT interval can predispose the heart to early afterdepolarizations, which can trigger TdP. This condition is particularly concerning because it can lead to syncope (loss of consciousness) and may progress to more severe arrhythmias if not promptly addressed.

In contrast, the other options listed are less directly related to QT prolongation. Heart block typically refers to issues in the conduction system of the heart that can result from various factors, but it is not a direct consequence of prolonged QT syndrome. Atrial flutter is an atrial arrhythmia with distinct mechanisms and is not usually associated with the effects of prolonged QT. Asystole, which is the absence of electrical activity in the heart (leading to