What complication is NOT typically associated with prolonged QT syndrome?

Prolonged QT syndrome, which can be congenital or acquired, is primarily associated with electrical disturbances in the heart that can lead to life-threatening complications. Among these, syncope, sudden cardiac death, and ventricular arrhythmias are all closely linked to the underlying mechanisms of prolonged QT syndrome.

The condition can lead to syncope due to arrhythmias that result from the prolonged repolarization phase of the cardiac cycle, particularly torsades de pointes, which can cause fainting spells. Similarly, the risk of sudden cardiac death arises from these arrhythmias, as they can lead to a loss of effective heart function and fatal outcomes. Ventricular arrhythmias are a direct consequence of the disturbances in the heart's electrical activity that characterize prolonged QT syndrome, making them a common complication.

In contrast, intellectual disability is not a recognized complication associated with prolonged QT syndrome. Although there may be syndromes that combine cardiac issues with neurodevelopmental concerns, prolonged QT syndrome itself does not typically cause or relate to intellectual disability. Thus, it stands out as the option that does not fit with the other complications that are characteristically associated with prolonged QT syndrome.