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Figure 6 Localized re-entry in a patient without a history of atrial fibrillation. (A) Presents the electroanatomic voltage map (lateral right atrial en face) created during this patient's previous mapping procedure (before ablation) together with the electrocardiographic features of the tachycardia. Note the low-amplitude P-wave (*). (B) shows the catheter position immediately superior to the region of electrical silence with (C) showing the resulting activation at the site of origin. The electrograms in this patient have not been arranged, but activity is observed throughout the tachycardia cycle length and is demonstrated visually in the schematic (D). In this patient, the atria could not be captured to perform entrainment from this site. AP = anterior-posterior; RL = right lateral.
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