Table 1.

Differential diagnosis of wide complex tachycardia

Ventricular tachycardia

Supraventricular tachycardia with aberrancy

Supraventricular tachycardia with preexisting bundle branch block

Antidromic supraventricular tachycardia using accessory pathways

Antegrade conduction over one bypass tract and retrograde conduction over another bypass tract

Atrial tachycardia with anterograde conduction over an accessory pathway

Atrioventricular nodal reentry with anterograde conduction down a bystander bypass tract