Radiofrequency catheter ablation targeting a left-sided accessory pathway successfully terminated coexisting orthodromic AVRT and AT, with no recurrence observed during follow-up.
Case Report (n=1)
This case highlights the complex electrophysiological interplay between coexisting AVRT and AT, and demonstrates successful treatment via radiofrequency ablation of the accessory pathway.
UNLABELLED: The coexistence of multiple supraventricular tachycardias during electrophysiological study (EPS) is rare and can complicate diagnosis and treatment. We present a case of coexisting orthodromic atrioventricular reentrant tachycardia (AVRT) and atrial tachycardia (AT) with spontaneous transitions. A 15-year-old girl with palpitations underwent EPS revealing orthodromic AVRT via a left-sided accessory pathway (AP) and AT originating from the right atrium. The tachycardias had similar cycle lengths and exhibited spontaneous transitions. During AT, a unique cyclic atrial activation sequence was observed, hypothesized to result from fusion of antegrade AT conduction and retrograde conduction via a left-sided AP. Radiofrequency catheter ablation targeting the AP successfully terminated the arrhythmias, with no recurrence observed during follow-up. This case highlights the complex electrophysiological interplay between coexisting AVRT and AT, the mechanism of spontaneous tachycardia transitions, and the unique cyclic fusion atrial activation pattern resulting from combined antegrade AT conduction and retrograde conduction via a left-sided AP. LEARNING OBJECTIVE: This case highlights the complex electrophysiological interplay between coexisting atrioventricular reentrant tachycardia and atrial tachycardia (AT), the mechanism of spontaneous tachycardia transitions, and the unique cyclic fusion atrial activation pattern resulting from combined antegrade AT conduction and retrograde conduction via a left-sided accessory pathway.
Yamashita et al. (Sat,) conducted a case report in Coexisting orthodromic atrioventricular reentrant tachycardia (AVRT) and atrial tachycardia (AT) (n=1). Radiofrequency catheter ablation targeting the accessory pathway was evaluated on Termination of arrhythmias and recurrence during follow-up. Radiofrequency catheter ablation targeting a left-sided accessory pathway successfully terminated coexisting orthodromic AVRT and AT, with no recurrence observed during follow-up.