In this section we have shown and discussed examples in which supraventricular tachycardia with aberration could be mistaken for ventricular tachycardia. Listed here are not only situations in which this may occur, but also situations in which a ventricular tachycardia might be mistaken for a supraventricular tachycardia. The former is particularly true in patients with WPW, when antegrade conduction to the ventricles occurs via the AV nodal bypass tract and in patients with preexisting conduction disturbances. The latter situation, in which a ventricular tachycardia may be mistaken for a supraventericular tachycardia conducted aberrantly, is particularly common in younger patients without obvious underlying heart disease.