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Figure 1 Rabbit model of rapid atrial pacing. (A) Two bipolar custom-made leads were inserted into the heart via the right and left cervical veins. The pacing electrode (P) was directed to the lateral wall of the right atrium; the sensing electrode (S) was placed in the coronary sinus to obtain bipolar electrograms from the left atrium. (B) Surface electrocardiographic (leads I and aVL) and bipolar left atrial electrogram (LA) in a rabbit during rapid atrial pacing with 600 beats/min (paper speed 100 mm/s).
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