Characteristics and outcomes of recurrent atrial fibrillation after prior failed pulmonary vein isolation
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Key result
Ablation of inducible non-pulmonary vein organized atrial arrhythmias was associated with a significantly reduced risk of late clinical atrial fibrillation recurrence (HR 0.12) compared to patients without these arrhythmias.
Why the study?
Mechanisms of AF recurrence after PVI catheter ablation are unclear, and the prevalence and effect of ablating non-PV organized atrial arrhythmias were unknown.
Does the identification and ablation of non-pulmonary vein organized atrial arrhythmias reduce atrial fibrillation recurrence in patients undergoing repeat ablation for failed pulmonary vein isolation?
Population
Patients undergoing repeat ablation for recurrent AF after prior PVI (59% persistent AF)
Comparison
Mapping and ablation of non-PV organized atrial arrhythmias vs no ablation of these targets
Design
Retrospective cohort study
Follow-up
Median 1.6 (IQR 0.7-6.3) years
Authors
Discussion
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Implication
May support targeting non-PV arrhythmias during repeat AF ablation; extends observational data but leaves open need for RCTs.
Study Design
Type
Observational (n=74)
Multicenter
Yes
Structured PICO
Does the identification and ablation of non-pulmonary vein organized atrial arrhythmias reduce atrial fibrillation recurrence in patients undergoing repeat ablation for failed pulmonary vein isolation?
P
Population
74 patients (mean age 66 years, 27% female) with recurrent atrial fibrillation after prior pulmonary vein isolation, followed for a median of 1.6 years.
E
Exposure
Mapping and ablation of non-pulmonary vein (non-PV) organized atrial arrhythmias (premature atrial contractions, atrial tachycardia, or macro-reentrant atrial flutter) induced by high-dose isoproterenol or standard mapping.
C
Comparator
Patients without inducible non-pulmonary vein organized atrial arrhythmias (who did not receive ablation for these specific targets).
O
Outcome
Time to clinical AF recurrence (AF, AFL, or AT >30 s occurring >3 months after repeat procedure).composite
Main Result
Hazard Ratio: 0.12 (95% CI 0.03–0.47)
p-value: p=<0.001
In patients undergoing repeat ablation for recurrent atrial fibrillation, identifying and ablating non-pulmonary vein organized atrial arrhythmias significantly reduces long-term AF recurrence and composite clinical outcomes.
Limitations
- Retrospective observational design limits causal inference
- Racial and ethnic description of the population was omitted due to high rate of missingness
- Modest sample size may be underpowered to detect the effect of different ablation strategies
- Residual confounding cannot be excluded
- Type of post-ablation arrhythmia monitoring after 1 year varied in the cohort
- Retrospective observational study design limits causal inferences
- Racial and ethnic description omitted due to high rate of missingness and unreliability
- Modest sample size may be underpowered
- Varying post-ablation arrhythmia monitoring strategies after 1 year
Cite This Study
Vanam et al. (2022) conducted an observational in Recurrent atrial fibrillation (n=74). Ablation of inducible non-pulmonary vein organized atrial arrhythmias vs. No inducible non-pulmonary vein organized atrial arrhythmias was evaluated on Recurrence of late clinical atrial fibrillation (HR 0.12, 95% CI 0.03-0.47, p=<0.001). Ablation of inducible non-pulmonary vein organized atrial arrhythmias was associated with a significantly reduced risk of late clinical atrial fibrillation recurrence (HR 0.12) compared to patients without these arrhythmias.
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