Mechanism and interpretation of two-for-one response to premature atrial complexes during atrioventricular node re-entry tachycardia

Abstract

A TFOR can occur in a small number of patients during AVNRT and is therefore not diagnostic of JT. However, HrPACs always perturbed the next His in these cases, confirming the diagnosis of AVNRT and allowing for differentiation from JT.