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Figure 3 (A) A conduction curve from a control patient. Each data point represents the delay of a fractionated potential at a particular S1S2 coupling interval. There is a slight fluctuation in the delay with premature stimulation until it increases rapidly at S1S2 intervals below 220 ms. (B) A conduction curve from a patient with atrial flutter. There is a rapid increase in delay and a gradual increase in electrogram duration at S1S2 intervals below 260 ms. (C) A conduction curve from a patient with atrial fibrillation. There is a gradual increase in delay and electrogram duration at S1S2 intervals below 310 ms.