What is the clinical evidence from this study?

Study design: Cohort. Population: Paroxysmal atrial fibrillation without low-voltage areas (n=158). Intervention: Transition zone (TZ) burden vs. Lower TZ burden. Primary outcome: Recurrence of atrial tachyarrhythmia lasting ≥ 30 s after a 3-month blanking period (adjusted HR 1.065, 95% CI 1.034-1.098, p=< 0.0001).

What does this research mean for the field?

In elderly patients with paroxysmal atrial fibrillation without low-voltage areas, a higher transition zone burden correlates with slower left atrial conduction velocity and independently predicts arrhythmia recurrence after circumferential pulmonary vein isolation. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To evaluate the relationship of left atrial transition zone (TZ) burden with conduction velocity and arrhythmia recurrence after circumferential pulmonary vein isolation (CPVI) in elderly patients with paroxysmal atrial fibrillation lacking low-voltage areas.

September 3, 2026Clinical CardiologyOpen Access

Association of Transition Zone Burden With Recurrence in Elderly Patients With Paroxysmal Atrial Fibrillation Without Low‐Voltage Areas

Q: What are the key findings of this study?

Higher transition zone burden independently predicted atrial tachyarrhythmia recurrence after ablation, with each 1% increase in burden raising the risk by 6.5% (adjusted HR 1.065).

Q: What does this research mean for the field?

In elderly patients with paroxysmal atrial fibrillation without low-voltage areas, a higher transition zone burden correlates with slower left atrial conduction velocity and independently predicts arrhythmia recurrence after circumferential pulmonary vein isolation. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

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Key result

Higher transition zone burden is linked to ~7% higher post-ablation arrhythmia recurrence per 1% increase.

adjusted HR 1.065
95% CI 1.034-1.098
P<0.0001
n=158

Why the study?

Transition zones may serve as a potential substrate for AF, but their relationship with left atrial conduction velocity and recurrence after CPVI in elderly paroxysmal AF patients without low-voltage areas is unknown.

Does transition zone burden predict atrial tachyarrhythmia recurrence in elderly patients with paroxysmal atrial fibrillation undergoing circumferential pulmonary vein isolation?

Population

158 elderly patients with paroxysmal AF without LVA undergoing CPVI

Comparison

TZ burden < 5% vs 5%-15% vs > 15%

Design

Cohort study

Follow-up

Mean 24.9 months

Authors

YWYuxuan WangChongqing Medical University YQYue QiuNantong University HWHaojun WangSuizhou Central Hospital

Discussion

Member takes

Implication

Transition zone burden may stratify post-ablation recurrence risk; leaves open whether targeting these zones improves outcomes in paroxysmal AF.

Key Points

To evaluate the relationship of left atrial transition zone (TZ) burden with conduction velocity and arrhythmia recurrence after circumferential pulmonary vein isolation (CPVI) in elderly patients with paroxysmal atrial fibrillation lacking low-voltage areas.
Enrolled 158 elderly patients (mean age 69.7 ± 3.8 years) with paroxysmal atrial fibrillation without low-voltage areas undergoing CPVI.
Categorized patients into three groups by left atrial TZ burden (< 5%, 5%–15%, and > 15%), defined by bipolar voltages of 0.5–1 mV in more than 3 adjacent points.
Followed patients for a mean of 24.9 ± 11.5 months; recurrence was defined as atrial tachyarrhythmia lasting ≥ 30 s after a 3-month blanking period.
Patients with higher TZ burden demonstrated significantly reduced anterior left atrial conduction velocity (1.52 ± 0.36 vs. 1.21 ± 0.27 vs. 1.02 ± 0.25 m/s, p < 0.0001).
Arrhythmia recurrence occurred in 40 (25.3%) patients overall: 3 (6.3%) in the TZ < 5% group, 17 (25.8%) in the TZ 5%–15% group, and 20 (45.5%) in the TZ > 15% group.
TZ burden independently predicted recurrence in multivariable Cox regression (adjusted HR 1.065 [95% CI 1.034–1.098], p < 0.0001), with a 14.55% cutoff best predicting recurrence (AUC 0.722 [95% CI 0.633–0.811]).

Study Design

Type

Cohort (n=158)

Multicenter

Structured PICO

Does transition zone burden predict atrial tachyarrhythmia recurrence in elderly patients with paroxysmal atrial fibrillation undergoing circumferential pulmonary vein isolation?

Population

158 elderly patients (aged 65-80 years) with paroxysmal atrial fibrillation without low-voltage areas undergoing first-time catheter ablation, followed for a mean of 24.9 months.

Exposure

Higher transition zone (TZ) burden (5%-15% or >15%) identified via 3D electroanatomic mapping during circumferential pulmonary vein isolation (CPVI).

Comparator

Lower transition zone (TZ) burden (<5%).

Outcome

Recurrence of any episode of atrial tachyarrhythmia (ATA) lasting ≥ 30 s after a 3-month blanking period.hard clinical

Main Result

Hazard Ratio: 1.065 (95% CI 1.034–1.098)

p-value: p=< 0.0001

In elderly patients with paroxysmal atrial fibrillation without low-voltage areas, a higher transition zone burden is associated with slower left atrial conduction velocity and independently predicts atrial tachyarrhythmia recurrence after pulmonary vein isolation.

Limitations

Single-center observational study focused on elderly patients with PAF, limiting generalizability to other populations.
Adopted TZ voltage cutoff values without revalidating them in patients without ATA.
Focused on global LACV rather than local conduction velocity within the TZ.
Septal LACV was not measured due to frequent double potentials.
Used intermittent rhythm monitoring techniques which may have underestimated asymptomatic recurrences.
Single-center and observational study focused on elderly patients with PAF, limiting generalizability to patients with LVA, persistent AF, or younger populations.
Thresholds to stratify TZ burden were applied as pragmatic categories rather than biologically established cut points.
Used intermittent rhythm monitoring techniques rather than wearable devices or implantable loop recorders, potentially underestimating asymptomatic recurrences.

Cite This Study

Wang et al. (2026) conducted a cohort in Paroxysmal atrial fibrillation without low-voltage areas (n=158). Transition zone (TZ) burden vs. Lower TZ burden was evaluated on Recurrence of atrial tachyarrhythmia lasting ≥ 30 s after a 3-month blanking period (adjusted HR 1.065, 95% CI 1.034-1.098, p=< 0.0001). Higher transition zone burden independently predicted atrial tachyarrhythmia recurrence after ablation, with each 1% increase in burden raising the risk by 6.5% (adjusted HR 1.065).

synapsesocial.com/papers/6a9935f3636c6408cfa7ea2f https://doi.org/10.1002/clc.70435

Topics

Atrial fibrillation Persistent AF management AF ablation outcomes Anticoagulation in AF

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Implication

Transition zone burden may stratify post-ablation recurrence risk; leaves open whether targeting these zones improves outcomes in paroxysmal AF.

Association of Transition Zone Burden With Recurrence in Elderly Patients With Paroxysmal Atrial Fibrillation Without Low‐Voltage Areas

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Limitations

Cite This Study

Topics

Association of Transition Zone Burden With Recurrence in Elderly Patients With Paroxysmal Atrial Fibrillation Without Low‐Voltage Areas

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Limitations

Cite This Study

Also Consider

Topics

Also Consider