Key result
Radiofrequency ablation successfully eliminated a focal atrial tachycardia with conduction block that exhibited widely-split P waves mimicking a distinct faster atrial tachycardia.
Case Report (n=1)
No
Focal atrial tachycardia with inter- and intra-atrial conduction block can produce widely-split P waves that mimic a faster atrial tachycardia on surface ECG.
A 57-year-old man with atrial tachycardia (AT) after cavo-tricuspid isthmus ablation underwent electrophysiological testing. Mapping revealed atrial activation with a cycle length exactly twice that of the P-P interval on electrocardiogram. Electroanatomic mapping revealed an AT focus near the left superior pulmonary vein, with inter-atrial conduction occurring in the lower septum and cavo-tricuspid isthmus conduction block. A propagation map demonstrated activation going down the left atrial posterior wall and right atrial free wall, generating different positive P waves in the inferior leads. The focal AT with inter- and intra-atrial conduction block exhibited widely-split P waves misinterpreted as a distinct AT.
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Yamada et al. (2008) conducted a case report in Atrial tachycardia (n=1). Electrophysiological study and radiofrequency catheter ablation was evaluated on Elimination of atrial tachycardia. Radiofrequency ablation successfully eliminated a focal atrial tachycardia with conduction block that exhibited widely-split P waves mimicking a distinct faster atrial tachycardia.
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