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Radiofrequency ablation for long-standing persistent AF shows intraprocedural conversion patterns linked to 1-year outcomesHeart Rhythm Shift During Surgery Predicts Better Long-Term Results

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Key Takeaway
Note that sequential intraprocedural AF-AFL-SR conversion, not direct AF termination, predicted better 1-year outcomes in this cohort.

This retrospective cohort study included 260 consecutive patients with long-standing persistent atrial fibrillation (AF lasting >12 months) at a single center. All underwent de novo radiofrequency catheter ablation using a standardized '2C3L plus' strategy, combining pulmonary vein isolation with linear and complex fractionated atrial electrogram ablation. The primary outcome was freedom from any documented atrial tachyarrhythmia lasting >30 seconds, off antiarrhythmic drugs, at 1-year follow-up.

Intraprocedural AF termination was achieved in 103 of 260 patients. Intraprocedural conversion to atrial flutter (AFL) was achieved in 90 of 260 patients and was associated with a reduced recurrence risk (adjusted HR: 0.306; 95% CI: 0.133–0.704, P = 0.005). Sequential intraprocedural conversion of AF-AFL-SR was a strong and independent predictor of arrhythmia-free survival (adjusted HR: 0.305; 95% CI: 0.119–0.784, P = 0.014).

In contrast, acute termination of AF directly to sinus rhythm was not associated with a lower risk of recurrence (adjusted HR: 0.765; 95% CI: 0.410–1.428, P = 0.400). Safety data, including adverse events, serious adverse events, discontinuations, and tolerability, were not reported.

Key limitations include the retrospective, single-center design and lack of a comparator group. The findings suggest that intraprocedural organization of AF-AFL-SR may be a meaningful prognostic endpoint, but causal inferences cannot be drawn. Clinicians should interpret these results as hypothesis-generating for procedural planning in persistent AF.

Why fixing this heart is so hard

Doctors have long tried to stop the chaos immediately. They believed returning to a normal beat right away was the only goal. But here is the twist. Stopping the irregular beat instantly does not guarantee a lasting fix.

Patients often wonder why the problem comes back after surgery. The answer might lie in how the heart behaves during the procedure. It is not just about the end result. It is about the journey the heart takes to get there.

The surprising shift in medical thinking

For years, surgeons aimed to stop the chaos immediately. They focused on getting the heart back to a normal rhythm as fast as possible. This was the standard rule for success.

New research challenges this old rule. It suggests that the path matters more than the destination. A specific transition during the operation tells a different story.

How the heart finds its way back

Think of your heart like a busy traffic intersection. When traffic jams happen, the flow stops completely. Sometimes, clearing the jam requires a specific sequence of events.

In this case, the heart moves from a fast rhythm to a flutter. Then, it finally settles into a normal beat. This step-by-step organization is the key signal.

It is like a conductor calming an orchestra before the final note. The music must organize before it ends. The heart needs to organize before it stays organized.

This process helps the electrical system reset properly. It ensures the heart is ready to hold a steady rhythm. Without this step, the chaos might return quickly.

What the data actually shows us

Researchers looked at 260 patients with long-term heart rhythm issues. They used a detailed mapping strategy during their procedures. The goal was to see what happened inside the heart during the operation.

The most important result was not about stopping the fast rhythm. It was about how the rhythm changed first. Patients whose hearts shifted to a flutter pattern did better.

Those who went from irregular beat to flutter to normal beat had the best outcomes. This sequence predicted freedom from arrhythmia for one full year.

The risk of the problem returning was much lower for them. They stayed healthy without needing extra medication. This gives doctors a clear sign of success.

This doesn’t mean this treatment is available yet.

Experts say this changes how we measure success during surgery. It suggests the heart needs to organize in a specific way. This organization is a sign the treatment worked deeper inside.

It helps doctors know if their work is truly effective. They can see if the heart is ready to stay healthy. This gives them a better target to aim for.

What this means for your care

You cannot use this information to treat yourself at home. It is a guide for your heart specialist during the procedure. If you are scheduled for surgery, ask about these markers.

Talk to your doctor about your specific risk factors. They can explain if this approach fits your situation. Do not change your medication without medical advice.

This study looked at past records from one hospital. It did not test new drugs or devices. More research is needed to confirm these results everywhere.

The group of patients was specific to one center. Results might vary in different hospitals or countries. We need larger groups to be sure.

Scientists will need more studies to validate these findings. Approval for new standards takes time and careful testing. Patients should remain hopeful but patient for real changes.

Future trials will test if this marker improves survival rates. Doctors will refine the technique based on this new knowledge. The goal is to help more people live without symptoms.

Medical progress is a marathon, not a sprint. Every step brings us closer to better care. Stay informed and keep the conversation with your doctor open.

Study Details

Study typeCohort
EvidenceLevel 3
PublishedApr 2026
View Original Abstract ↓
BackgroundLong-standing persistent atrial fibrillation (LSPAF) remains a challenge of catheter ablation. The efficiency and optimal procedural endpoints of “2C3L plus” approach—a strategy combining pulmonary vein isolation (PVI) with linear and complex fractionated atrial electrogram (CFAEs) ablation—is unclear.MethodsThis single-center, retrospective cohort study included 260 consecutive patients with LSPAF (defined as continuous AF lasting > 12 months) who underwent de novo radiofrequency catheter ablation between January 2020 and January 2022. All patients received a standardized “2C3L plus” strategy. The primary endpoint was freedom from any documented atrial tachyarrhythmia lasting >30 s, off antiarrhythmic drugs, at 1-year follow-up. Predictors of recurrence were analyzed using multivariable Cox regression analysis.ResultsIntraprocedural atrial fibrillation (AF) termination was achieved in 103 of 260 (39.6%) patients and 90 (34.6%) patients converted to atrial flutter (AFL) during ablation. Acute termination of AF directly to sinus rhythm (SR) was not associated with a lower risk of recurrence (adjusted HR: 0.765, 95% CI: 0.410–1.428, P = 0.400). However, intraprocedural conversion from AF to AFL was associated with significantly reduced recurrence risk (Uni: HR: 0.319, 95% CI: 0.142–0.714, P = 0.005; adjusted HR: 0.306, 95% CI: 0.133–0.704, P = 0.005). Further analysis revealed that the sequential intraprocedural conversion of AF-AFL-SR during ablation was a strong and independent predictor of arrhythmia-free survival (Uni: HR: 0.275, 95% CI: 0.108–0.696, P = 0.006; adjusted HR: 0.305, 95% CI: 0.119–0.784, P = 0.014).ConclusionIn patients with LSPAF undergoing extensive “2C3L Plus” substrate ablation, the intraprocedural organization of AF-AFL-SR, rather than AF termination itself, emerged as a powerful independent predictor of 1-year arrhythmia-free survival, suggesting its value as a more meaningful prognostic endpoint.
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