Key result
EP study reveals recurrent SVT driven by a posteroseptal accessory pathway after prior lateral ablation.
Why the study?
The mechanism of new supraventricular tachycardia after previous left lateral accessory pathway ablation remains unclear.
Case Report (n=1)
This case highlights the diagnostic challenge of differentiating a new versus previously missed posteroseptal accessory pathway during a redo ablation for SVT.
May aid mechanism diagnosis in post-ablation SVT; leaves open generalizability without larger confirmatory series.
A 49-year-old male patient underwent a redo procedure for supraventricular tachycardia.He had a history of left accessory pathway (AP) ablation in an outside hospital 2 years ago.Dual AV nodal physiology was absent during atrial pacing, while programmed RV extrastimuli showed fixed VA interval with the earliest A on His catheter.Narrow QRS tachycardia could be induced with either RV or atrial pacing, showing the identical concentric atrial sequence to RV pacing.RV overdrive pacing was performed during tachycardia (Figure 1).Is this a "new" posteroseptal AP or a posteroseptal AP missed during the previous ablation?
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Xiong et al. (2025) conducted a case report in Supraventricular tachycardia (n=1). Electrophysiological study was evaluated on Mechanism of new SVT. Electrophysiological study in a 49-year-old male with recurrent SVT after previous left lateral accessory pathway ablation demonstrated findings suggestive of a posteroseptal accessory pathway.
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