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. 2023 Dec 15;40(1):131–142. doi: 10.1002/joa3.12976

FIGURE 4.

FIGURE 4

Patient 9. Intracardiac electrograms recorded during (A,B) slow–fast AVNRT with a bystander cNVP connected to the SP and during (C) fast–slow AVNRT. (A) The PVC delivered during His‐refractoriness delays the tachycardia with a delay of the His preceding a delay of the atrium, indicating presence of an AP (Step 1). (B) The reset phenomenon disappears after the early PVC, indicating that the tachycardia is sustained despite conduction block over the AP, which is diagnostic of slow‐fast AVNRT with a bystander cNVP connected to the SP and rules out ORT (Step 2). (C) In contrast, the His‐refractory PVC terminates the tachycardia without atrial capture in the fast–slow AVNRT. Abbreviations are as in Figure 2.