Try to interpret the above Intracardiac tracing. Most will notice the very short VA time prior to VODP, which already argues strongly against AVRT. Just before termination, there is full RV capture at 300ms, with the atria continuing independently at 335ms. This VA dissociation would be highly unusual in AVRT, as AVRT requires both atrial and ventricular participation to sustain the circuit. The tachycardia would not persist this long under these conditions if AVRT were the mechanism. It would either terminate immediately or the atria would be accelerated to the pacing cycle length prior to termination. If the tachycardia terminates without atrial acceleration, think AVNRT. If the atria never depolarise to the pacing cycle length, atrial tachycardia is not possible. So the most likely diagnosis in above tracing is AVNRT Systematic Evaluation of EP Maneuvers to Diagnose AVNRT During Electrophysiology Study (EPS) --- Introduction Atrioventricular Nodal Reentrant Tachycardia (A...