What conduction disorder involves an abnormal pathway for electrical impulses from the atria to the ventricles?

Wolff-Parkinson-White Syndrome is characterized by the presence of an abnormal conduction pathway known as an accessory pathway, which allows electrical impulses to bypass the normal route through the atrioventricular (AV) node. This can lead to a condition called pre-excitation, where the ventricles are activated earlier than they would be through the standard conduction system. This abnormal conduction can cause episodes of tachycardia, as the extra pathway can cause reentrant circuits between the atria and ventricles.

In contrast, Long QT Syndrome primarily affects the repolarization phase of the cardiac cycle and does not create an abnormal pathway for impulses. Bradycardia refers to a slower than normal heart rate, which may or may not involve abnormal pathways, but it does not specifically describe a condition involving abnormal conduction pathways between the atria and ventricles. Atrial Fibrillation is characterized by irregular and chaotic electrical activity in the atria, leading to ineffective atrial contractions, but does not involve a bypass tract in the way that Wolff-Parkinson-White Syndrome does. Thus, the identification of this specific abnormal conduction pathway makes Wolff-Parkinson-White Syndrome the correct answer.