Unipolar Voltage-Guided Substrate Modification Plus Pulsed Field Ablation Pulmonary Vein Isolation Versus Pulmonary Vein Isolation Alone in Persistent Atrial Fibrillation (UNI-PFA)
Unipolar Voltage-Guided Individualized Substrate Modification Combined With Pulsed Field Ablation-Based Pulmonary Vein Isolation Versus Pulmonary Vein Isolation Alone in Persistent Atrial Fibrillation: A Multicenter, Randomized, Open-Label, Superiority Trial
UNI-PFA is a multicenter, randomized, open-label, superiority trial evaluating whether adding unipolar voltage-guided individualized substrate modification to pulsed field ablation (PFA)-based pulmonary vein isolation (PVI) improves outcomes in patients with persistent atrial fibrillation and a left atrial low-voltage area (LVA) burden of at least 10% of the post-PVI left atrial surface area. Participants are randomized 1:1 to PFA-PVI plus individualized substrate modification (homogenization, box isolation, linear ablation, or a combination) or PFA-PVI alone. The primary endpoint is treatment success at 12 months, defined as freedom from documented atrial fibrillation, atrial tachycardia, or atrial flutter lasting more than 30 seconds after a 90-day blanking period while off class I/III antiarrhythmic drugs. Follow-up includes 14-day continuous ECG patch monitoring at 3, 6, and 12 months, symptom-triggered single-lead ECG, and quality-of-life assessments.
Studieoversigt
Status
Status
Betingelser
Betingelser
Intervention / Behandling
Intervention / Behandling
Detaljeret beskrivelse
Background: Pulmonary vein isolation (PVI) is the cornerstone of catheter ablation for atrial fibrillation, but outcomes in persistent atrial fibrillation remain suboptimal, with approximately 50% freedom from recurrence in unselected patients. Left atrial low-voltage areas (LVAs) are an electrical surrogate for atrial fibrosis and predict recurrence after PVI. Unipolar voltage mapping may detect intramural or epicardial fibrosis that bipolar mapping misses. Pulsed field ablation (PFA) provides preferential myocardial ablation with a favorable safety profile. Whether adding unipolar voltage-guided individualized substrate modification to PFA-PVI improves outcomes in patients with a substantial LVA burden is unknown.
Design: UNI-PFA is a multicenter, randomized, open-label, superiority trial. Approximately 294 participants with persistent or long-standing persistent atrial fibrillation and a unipolar LVA burden of at least 10% of the post-PVI left atrial surface area (excluding the pulmonary vein antra, left atrial appendage, and fossa ovalis) will be randomized 1:1. Randomization is stratified by sex and LVA proportion category (10-20%, 20-30%, and >30%). The experimental arm receives PFA-PVI plus individualized substrate modification selected according to LVA location (homogenization, box isolation, linear ablation, or a combination); the active comparator arm receives PFA-PVI alone. All participants receive 14-day continuous ECG patch monitoring at 3, 6, and 12 months, symptom-triggered single-lead ECG, and unscheduled ECG/Holter/telemetry when clinically indicated.
Endpoints: The primary endpoint is treatment success at 12 months, defined as freedom from documented atrial fibrillation, atrial tachycardia, or atrial flutter lasting more than 30 seconds after a 90-day blanking period while off class I/III antiarrhythmic drugs, allowing up to one repeat ablation within 6 months of the index procedure. Patients who remain on class I/III antiarrhythmic drugs at 12 months are counted as treatment failures. Twelve prespecified secondary endpoints include arrhythmia-free survival, quality of life (AFEQT), arrhythmia burden, repeat ablation, procedure duration, and fluoroscopy time. Sixteen prespecified safety endpoints are adjudicated by an independent, blinded clinical events committee.
Eligibility: Adults aged 18 years or older with symptomatic persistent or long-standing persistent atrial fibrillation, suitable for catheter ablation, who have tried at least one class I/III antiarrhythmic drug or are unwilling to do so, and who meet the intraoperative unipolar LVA criterion. Key exclusions include left atrial diameter >55 mm, recent acute coronary syndrome or coronary artery bypass grafting, severe valvular disease, prior atrial fibrillation ablation or left atrial surgery, NYHA class IV heart failure, contraindication to oral anticoagulation, dialysis-dependent renal failure, and pregnancy.
Undersøgelsestype
Undersøgelsestype
Tilmelding (Anslået)
Tilmelding
Fase
Fase
- Ikke anvendelig
Kontakter og lokationer
Studiekontakt
Studiekontakt
- Navn: Ligang Ding, MD, PhD
- Telefonnummer: +8601088233162
- E-mail: dlgang@163.com
Studiesteder
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-
Beijing Municipality
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Beijing, Beijing Municipality, Kina, 100037
- Fuwai Hospital, Chinese Academy of Medical Sciences
-
Kontakt:
- Ligang Ding, MD, PhD
- Telefonnummer: +8601088233162
- E-mail: dlgang@163.com
-
Ledende efterforsker:
- Ligang Ding, MD, PhD
-
-
Deltagelseskriterier
Berettigelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Beskrivelse
Inclusion Criteria:
- ECG-documented persistent or long-standing persistent atrial fibrillation (ESC definition).
- Symptoms (palpitations, dyspnea, fatigue, etc.) attributable to atrial fibrillation.
- Suitable for catheter ablation.
- At least one class I/III antiarrhythmic drug has been tried, or the patient is unwilling to try.
- Age 18 years or older.
- Intraoperative left atrial voltage mapping demonstrating a unipolar low-voltage area (cutoff 2.5 mV) of at least 10% of the post-PVI left atrial surface area (excluding the pulmonary vein antra, left atrial appendage, and fossa ovalis).
Exclusion Criteria:
- Left atrial diameter >55 mm on echocardiography.
- Acute coronary syndrome or coronary artery bypass grafting within 12 weeks.
- Severe aortic or mitral valve disease (ESC definition).
- Congenital heart disease.
- Prior surgical or percutaneous atrial fibrillation ablation, or atrioventricular node ablation.
- Prior left atrial surgery.
- Comorbidity with expected survival <1 year.
- NYHA class IV heart failure symptoms.
- Contraindication to oral anticoagulation.
- Dialysis-dependent renal failure.
- Atrial fibrillation due to reversible causes.
- Pregnancy or women of childbearing potential not using contraception.
- History of poor treatment adherence.
- Unable or unwilling to provide informed consent.
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Behandling
- Tildeling: Randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Enkelt
Antal våben
Våben og indgreb
Deltagergruppe / ArmDeltagergruppe / Arm |
Intervention / BehandlingIntervention / Behandling |
|---|---|
|
Eksperimentel: PFA-PVI Plus Individualized Substrate Modification
Pulsed field ablation (PFA)-based pulmonary vein isolation plus unipolar voltage-guided individualized substrate modification. Substrate modification is selected according to low-voltage area location and may include homogenization, box isolation, linear ablation, or a combination. |
Pulsed field ablation catheter and generator used to perform pulmonary vein isolation in both study arms. Pulsed field ablation-based pulmonary vein antral isolation with confirmation of entrance and exit block in all pulmonary veins; performed in both arms. Unipolar voltage-guided individualized substrate modification selected according to low-voltage area location, including homogenization, box isolation, linear ablation, or a combination. Performed in the experimental arm only. |
|
Aktiv komparator: PFA-PVI Alone
Pulsed field ablation (PFA)-based pulmonary vein isolation alone, without substrate or prophylactic ablation. |
Pulsed field ablation catheter and generator used to perform pulmonary vein isolation in both study arms. Pulsed field ablation-based pulmonary vein antral isolation with confirmation of entrance and exit block in all pulmonary veins; performed in both arms. |
Hvad måler undersøgelsen?
Primære resultatmål
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
|
Treatment Success at 12 Months After the Index Ablation Procedure
Tidsramme: 12 months after the index ablation procedure
|
Freedom from documented atrial fibrillation, atrial tachycardia, or atrial flutter lasting more than 30 seconds after a 90-day blanking period while off class I/III antiarrhythmic drugs, allowing up to one repeat ablation within 6 months of the index procedure (1-2 procedures total). Patients who remain on class I/III antiarrhythmic drugs at 12 months are counted as treatment failures; missing primary outcome data are counted as treatment failures. |
12 months after the index ablation procedure
|
Sekundære resultatmål
Sekundære resultatmål
Resultatmål |
Tidsramme |
|---|---|
|
Time to First Recurrence After a Single Procedure Off Antiarrhythmic Drugs
Tidsramme: 12 months after the index procedure
|
12 months after the index procedure
|
|
Change in AFEQT Quality-of-Life Score From Baseline to 12 Months
Tidsramme: Baseline and 12 months
|
Baseline and 12 months
|
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Incidence of Prespecified Procedure-Related Complications
Tidsramme: 90 days after ablation; all-cause mortality at 12 months
|
90 days after ablation; all-cause mortality at 12 months
|
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Freedom From Atrial Arrhythmia at 12 Months After a Single Procedure Off Antiarrhythmic Drugs
Tidsramme: 12 months
|
12 months
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Freedom From Atrial Arrhythmia at 12 Months After a Single Procedure With or Without Antiarrhythmic Drugs
Tidsramme: 12 months
|
12 months
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Freedom From Atrial Arrhythmia at 12 Months After 1-2 Procedures With or Without Antiarrhythmic Drugs
Tidsramme: 12 months
|
12 months
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Freedom From Atrial Fibrillation at 12 Months After 1-2 Procedures Off Antiarrhythmic Drugs
Tidsramme: 12 months
|
12 months
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Atrial Arrhythmia Burden at 3, 6, and 12 Months
Tidsramme: 14-day period before each follow-up visit
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14-day period before each follow-up visit
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Time to First Recurrence After Any Number of Procedures
Tidsramme: 12 months
|
12 months
|
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Number of Repeat Ablations Within 12 Months
Tidsramme: 12 months after the index procedure
|
12 months after the index procedure
|
|
Procedure Duration
Tidsramme: Index procedure
|
Index procedure
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Total Fluoroscopy Time
Tidsramme: Index procedure
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Index procedure
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Samarbejdspartnere og efterforskere
Sponsor
Sponsor
Samarbejdspartnere
Samarbejdspartnere
Efterforskere
Efterforskere
- Ledende efterforsker: Ligang Ding, MD, PhD, Chinese Academy of Medical Sciences, Fuwai Hospital
Datoer for undersøgelser
Studer store datoer
Studiestart (Anslået)
Studiestart
Primær færdiggørelse (Anslået)
Primær færdiggørelse
Studieafslutning (Anslået)
Studieafslutning
Datoer for studieregistrering
Først indsendt
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først indsendt, der opfyldte QC-kriterier
Først opslået (Faktiske)
Først opslået
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Faktiske)
Sidste opdatering sendt
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
Andre undersøgelses-id-numre
- UNI-PFA-2026-001
Plan for individuelle deltagerdata (IPD)
Planlægger du at dele individuelle deltagerdata (IPD)?
IPD-planbeskrivelse
Individual participant data will not be shared. Aggregate study results will be published and presented. The informed consent and institutional data-governance approvals do not permit public deposition of individual participant data.
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