Below is an ECG displaying a right bundle branch block with an anterior ... QRS complex returns. A rate-dependent RBBB can, at times, be mistaken for ventricular tachycardia.

If the QRS complex is widened and downwardly deflected in lead V1, a left bundle branch ... a rate-dependent LBBB can at times be difficult to distinguish from ventricular tachycardia because ...

x It is possible (though unlikely) that tachycardia is in fact AVNRT yet ... collide in the RV while excitation spreads from the left bundle towards the pathway. Both V at the insertion site ...