What does this research mean for the field?

Second-generation cryoballoon ablation yields a similar rate of ATP-provoked dormant pulmonary vein conduction compared to contact force-based radiofrequency ablation, with its efficacy and durability mechanistically driven by significant pulmonary vein distension and the creation of wide unexcitable ablation zones. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

This research investigates how cryoballoon ablation works effectively for pulmonary vein isolation in atrial fibrillation.

January 1, 2017Journal of Atrial Fibrillation

Mechanistic Insights Into Durable Pulmonary Vein Isolation Achieved by Second-Generation Cryoballoon Ablation

Q: What is the clinical evidence from this study?

Study design: Cohort. Population: Atrial fibrillation (n=112). Intervention: Second-generation cryoballoon ablation vs. Contact force-based radiofrequency ablation. Primary outcome: ATP-provoked dormant conduction per pulmonary vein (p=0.3935).

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Key result

Second-generation cryoballoon ablation yielded a similar rate of ATP-provoked dormant pulmonary vein conduction compared to contact force-based radiofrequency ablation (4% vs 6%, P=0.3935).

Why the study?

Does second-generation cryoballoon ablation improve lesion characteristics and unexcitable tissue width compared to contact force-based radiofrequency ablation in patients with atrial fibrillation?

Key Points

This research investigates how cryoballoon ablation works effectively for pulmonary vein isolation in atrial fibrillation.
Compared lesion characteristics in 112 patients undergoing pulmonary vein isolation with CBA or RF ablation.
Evaluated 3D PV morphology and created 3D left atrial voltage maps post-ablation.
Assessed dormant conduction using pacing techniques in both groups.
Cryoballoon significantly distends the pulmonary vein by 7.1±3.5 mm compared to 4.0±4.0 mm at sites with residual potential (P<0.0001).
Wider unexcitable ablated tissue zones were observed in cryoballoon patients (16.7±5.1 mm) compared to CF patients (5.3±2.3 mm, P<0.0001).
Dormant conduction occurred in 4% of PVs in the CBA group versus 6% in the CF group (P=0.3935).

Study Design

Type

Cohort (n=112)

Blinding

Single-blind

Randomization

None

Multicenter

Structured PICO

Does second-generation cryoballoon ablation improve lesion characteristics and unexcitable tissue width compared to contact force-based radiofrequency ablation in patients with atrial fibrillation?

Population

112 consecutive patients treated for symptomatic paroxysmal atrial fibrillation (n=88) or persistent atrial fibrillation (n=24), mean age 63.8 years, 64% male, at a single center in Japan.

Intervention

Pulmonary vein isolation (PVI) performed by second-generation cryoballoon ablation (CBA) using a 28-mm cryoballoon (n=56).

Comparator

Pulmonary vein isolation (PVI) performed by contact force (CF)-based radiofrequency catheter ablation using a point-by-point method (n=56).

Outcome

Lesion characteristics including 3-dimensional PV morphology/distension before and after cryoballoon inflation, 3D left atrial voltage map, electrically unexcitable ablated tissue width, and ATP-provoked dormant conduction.surrogate

Main Result

Absolute Event Rate: 4% vs 6%

p-value: p=0.3935

Second-generation cryoballoon ablation creates significantly wider unexcitable ablation zones than contact force-guided RF ablation, likely due to extensive PV distension, which may explain its durability.

Limitations

Small patient group size
Distension assessments performed in only approximately half of the study patients
Measurement of PV distension may include an artefact since it was not performed using an absolute geometrical/spatial reference
Did not analyze CBA lesions and PV reconnection sites in the chronic phase
Difficulty in identifying sites of capture within the short sleeve of the RIPV and LIPV, which were excluded from the unexcitable region analysis.

Discussion

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Implication

Similar dormant conduction rates with cryoballoon versus contact force ablation; leaves open whether lesion characteristics affect durability.

Cite This Study

Okumura et al. (2017) conducted a cohort in Atrial fibrillation (n=112). Second-generation cryoballoon ablation vs. Contact force-based radiofrequency ablation was evaluated on ATP-provoked dormant conduction per pulmonary vein (p=0.3935). Second-generation cryoballoon ablation yielded a similar rate of ATP-provoked dormant pulmonary vein conduction compared to contact force-based radiofrequency ablation (4% vs 6%, P=0.3935).

synapsesocial.com/papers/6a1dddabef3fa0b4c0ef7d0c https://doi.org/10.4022/jafib.1538

Topics

Atrial fibrillation Persistent AF management AF ablation outcomes

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Implication

Similar dormant conduction rates with cryoballoon versus contact force ablation; leaves open whether lesion characteristics affect durability.

Mechanistic Insights Into Durable Pulmonary Vein Isolation Achieved by Second-Generation Cryoballoon Ablation

Key Points

Study Design

Structured PICO

Main Result

Limitations

Discussion

Implication

Cite This Study

Topics

Mechanistic Insights Into Durable Pulmonary Vein Isolation Achieved by Second-Generation Cryoballoon Ablation

Key Points

Study Design

Structured PICO

Main Result

Limitations

Discussion

Implication

Cite This Study

Also Consider

Topics

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