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Figure 1 Derived ("filtered") atrial waveforms. (A) Electrocardiogram (ECG) shows isthmus-dependent atrial flutter with labeled F-wave sample. (B) Correlation of this sample to successive ECG time points produces a correlation time series that reflects "filtered" atrial activity. Peaks (r ${approx}$ 1) identify F-waves even when partly overlying QRS/T waves.

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