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Figure 4 Scatterplot of change in electrogram duration versus S1S2 interval at which delay starts to increase. Each point is the mean of all the observations in a particular patient. The discriminant line (A) separates the atrial flutter patients from the control patients, and the other line (B) separates the atrial fibrillation patients from the atrial flutter patients. AF = atrial fibrillation; AFL = atrial flutter.
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