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Figure 1 Entrainment of atrioventricular node re-entrant tachycardia (AVNRT) from the right ventricular septum (RVS) at a cycle length of 510 ms. (A) The ventriculo-atrial (VA) interval and tachycardia cycle length (TCL) are measured immediately before entrainment. (B) The stimulus-atrial (S-A) interval is measured from the last pacing stimulus to the last entrained high right atrial (HRA) electrogram, and the post-pacing interval (PPI) is measured from the last pacing stimulus to the return cycle RV electrogram. The S-A–VA interval is 120 ms, and the PPI–TCL is 150 ms. HBd = His bundle distal; S = stimulus.
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