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Atrial fibrillation (AF) was directly induced by high‐frequency stimulation (HFS) (2.4 V) at the pulmonary vein (PV). AV block was also observed before initiation of AF. HFS consisted of trains of high‐frequency electrical stimuli (200 Hz, 0.1 ms in duration of each impulse, train duration 40 ms, 0.6‐12 V), and were delivered at 2 ms after each pacing stimulus (two threshold at a cycle length of 330 ms)6
