February 15, 2000Circulation
Dual-Loop Intra-Atrial Reentry in Humans
Key result
Radiofrequency ablation of figure-8 double-loop tachycardias in patients with prior surgical atriotomy required ablation at two isthmuses, resulting in no recurrences after 19 months.
Why the study?
Does linear radiofrequency ablation of both loops in dual-loop atrial reentrant tachycardias prevent recurrence in patients with prior surgical closure of an atrial septal defect?
Population
5 patients with drug-resistant atrial tachycardia, studied 24+/-15 years after surgical closure of an ostium…
Design
Case_series
Follow-up
19+/-6 months
Authors
Discussion
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Member takes
Implication
Supports targeting both isthmuses in post-atriotomy figure-8 tachycardias; hypothesis-generating from case-report data.
Study Design
Type
Observational (n=5)
Structured PICO
Does linear radiofrequency ablation of both loops in dual-loop atrial reentrant tachycardias prevent recurrence in patients with prior surgical closure of an atrial septal defect?
P
Population
5 patients (3 men, 2 women; mean age, 48+/-16 years) with drug-resistant atrial tachycardia, studied 24+/-15 years after surgical closure of an ostium secundum atrial septal defect.
I
Intervention
Tachycardia mapping with multipolar catheters and 3-dimensional electroanatomic mapping system (Biosense), followed by linear radiofrequency ablation of the narrowest part of each complete loop.
O
Outcome
Tachycardia recurrence
Figure-8 double-loop tachycardias can occur after surgical atriotomy and require ablation of both loops to successfully prevent recurrence.
Cite This Study
Shah et al. (2000) conducted an observational in Drug-resistant atrial tachycardia (n=5). Radiofrequency ablation was evaluated on Recurrence of tachycardia. Radiofrequency ablation of figure-8 double-loop tachycardias in patients with prior surgical atriotomy required ablation at two isthmuses, resulting in no recurrences after 19 months.