Biventricular activation of right bundle branch block pattern ventricular tachycardia originating from the right ventricle in Ebstein’s anomaly

●In a case of Ebstein’s anomaly (EA) with an arrhythmogenic substrate in an atrialized right ventricle (RV), ventricular tachycardia (VT) could potentially present with a right bundle branch block (RBBB) morphology.●RBBB-pattern VT originating from the RV could propagate slowly across the RV following immediate activation of the entire left ventricle (LV).●In EA, even when VT exhibits RBBB morphology, it is important to consider the possibility of the presence of an arrhythmogenic substrate in the RV rather than the LV.