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Figure 2 Two sets of electrograms obtained from the high posterior right atrium while the high anterior wall was paced. The left-hand set was obtained from a control patient and the right-hand set was obtained from a patient with atrial fibrillation (AF). The electrograms in each pair were recorded in response to the same stimulus-coupling interval during the pacing protocol. The electrograms from the patient with AF demonstrate that with increasing stimulus prematurity, there is increasing fragmentation in the electrogram and increasing latency of its individual potentials.
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