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Figure 3 The two different patterns of repetitive atrial tachycardia identified in the eight patients according to the behavior of ectopic atrial cycle length. Panels A and B are representative of the pattern observed in seven patients. The first atrial tachycardia cycle length is relatively long; the second is the shortest, and after that a gradual lengthening of the cycle length occurs until the end of the salvos. Panel C shows the erratic atrial tachycardia cycle length observed in only one patient. HRA = high right atrium electrogram.