Figure 1
Typical slow–fast AVNRT. Earliest retrograde atrial activation is recorded either at proximal His or distal CS (CS 1–2) and proximal His (His 3–4). I–V6, 12-lead ECG leads; HRA, high right atrium; His, His bundle electrogram; CS, coronary sinus.

Typical slow–fast AVNRT. Earliest retrograde atrial activation is recorded either at proximal His or distal CS (CS 1–2) and proximal His (His 3–4). I–V6, 12-lead ECG leads; HRA, high right atrium; His, His bundle electrogram; CS, coronary sinus.

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