An unusual property of the fasciculoventricular pathway with conduction block

Fasciculoventricular pathways (FVPs) are known to be rare variants of pre‐excitation syndrome without any observed clinical tachycardia. They are accessory connections from the bundle of His or the fascicles (Figure 1A), inserted into the ventricular myocardium, and they conduct whenever the bundle of His is engaged. (1) Patients with FVPs exhibit ventricular preexcitation on electrocardiogram (ECG) but do not experience reciprocating tachycardias or sudden cardiac death. This is unlike Wolff-Parkinson-White syndrome when individuals with electrocardiographic preexcitation experience symptoms like palpitations or presyncope.