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Figure 6 (A) Electrocardiogram showing recurrent atrial flutter of the same patient from Figure 6. (B) The map of the activation wave front during tachycardia; the color range depicts red as the earliest activation and magenta as the latest. The arrow points to the electrogram of the mapping electrodes at the left atrial roof where complex fractionated atrial electrograms with mid-diastolic potentials were recorded. Radiofrequency application at this site terminated the tachycardia (C). Biomap D = distal electrodes; Biomap P = proximal electrodes; CS = coronary sinus.