Differentiating pacemaker-mediated tachycardia from tachycardia due to atrial tracking: Utility of V-A-A-V versus V-A-V response after postventricular atrial refractory period extension
Cardiac Pacing, Artificial
Electrophysiologic Techniques, Cardiac
In the presence of intact AV conduction, the V-A-V response to PVARP extension is specific to atrial (or sinus) tachycardia, whereas the V-A-A-Vs response is specific to PMT. Recognizing the difference between the two forms of pacemaker-facilitated tachycardias has important implications for pacemaker programming.