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Figure 1 Electrocardiograms before (left) and after (right) radiofrequency (RF) AV nodal ablation. Recordings from top to bottom are from the surface electrocardiogram (ECG), the distal electrode (A-V), and from the electrode across the bundle of His. The His bundle potentials are circled. Atrial and ventricular potentials correspond to the electrocardiographic P and QRS waves. Note the production of complete heart block on the right.
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