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Figure 4 Antegrade and Retrograde AV Conduction After Isolation

The antegrade atrioventricular (AV) conduction and retrograde ventriculoatrial (VA) conduction remained intact after the small atrial segment was isolated. (A) Pacing from the isolated atrial segment at 150 beats/min subsequently activated the ventricles with 1:1 AV conduction. (B) Pacing the left ventricle at 150 beats/min resulted in 1:1 VA conduction. LV = recording from the left ventricle; PACE = recording from pacing lead inserted into the isolated atrial segment; other abbreviations as in Figure 2.