What does a long QT interval increase the risk of?

A long QT interval is primarily associated with an increased risk of Torsades de pointes, which is a specific type of polymorphic ventricular tachycardia. The QT interval represents the time taken for the heart's ventricles to depolarize and then repolarize during the cardiac cycle. When this interval is prolonged, it can disrupt the normal electrical activity of the heart, potentially leading to dangerous arrhythmias.

Torsades de pointes is particularly linked to a prolonged QT as it can manifest when there is abnormal repolarization of the heart's ventricles. This condition is characterized by a rapid, twisting appearance on the electrocardiogram and can lead to more serious outcomes like ventricular fibrillation or sudden cardiac death if not treated promptly.

While other arrhythmias like atrial fibrillation, ventricular tachycardia, and bradycardia are important to recognize, they are not predominantly related to the long QT syndrome in the same direct manner as Torsades de pointes. Understanding the specific risks associated with a long QT interval is vital for effective monitoring and management in clinical settings.