Unipolar Voltage Mapping for Personalized Atrial Fibrillation Ablation (UNIQS-AF)

June 2, 2026 updated by: Yuhe Jia, China National Center for Cardiovascular Diseases

Unipolar Mapping for Personalized Atrial Fibrillation Ablation: An Interventional Study on Arrhythmia Maintenance and Atrial Remodeling

Atrial fibrillation (AF) is a common heart rhythm disorder. While catheter ablation is an effective treatment, many patients still experience AF recurrence after the procedure. One major reason is that the mechanisms that maintain AF are not fully understood. Research suggests that the outer layer of the heart (epicardium) may play an important role in keeping AF going. However, current mapping techniques have limitations in detecting electrical signals from both the inner and outer heart layers.

This study uses a different technique called unipolar voltage mapping, which may more accurately capture electrical signals from both heart layers. Specifically, we focus on a specific type of electrical signal called "QS potential" on unipolar mapping, which reflects breakthrough sites between the inner and outer heart layers.

In this interventional study, participants with AF undergoing catheter ablation will receive personalized ablation guided by unipolar QS-potential mapping. We aim to:

Explore the relationship between unipolar QS-potentials and AF maintenance and atrial remodeling Evaluate the effectiveness of QS-potential guided personalized AF ablation

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

200

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • China
    • Beijing Municipality
      • Beijing, Beijing Municipality, China, 100037
        • Recruiting
        • Fuwai Hospital
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

Age ≥ 18 years and ≤ 80 years

Documented diagnosis of atrial fibrillation (paroxysmal or persistent)

Planned to undergo catheter ablation for AF (including patients with recurrent AF after prior ablation)

Able and willing to provide written informed consent

Able to complete scheduled follow-up visits (3 months post-ablation)

Exclusion Criteria:

Left ventricular ejection fraction < 35%

Severe valvular heart disease (moderate to severe mitral stenosis or regurgitation)

History of intracardiac thrombus

Contraindication to anticoagulation

Active infection or sepsis

Pregnancy or breastfeeding

Life expectancy < 12 months due to comorbid conditions

Participation in another interventional clinical trial within 30 days prior to enrollment

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: QS-Guided Ablation Group
Participants in this arm undergo catheter ablation for atrial fibrillation guided by unipolar QS-potential mapping. Ablation is delivered to these identified target sites in addition to standard pulmonary vein isolation.
Procedure: Unipolar QS-Potential Guided Catheter Ablation
Participants in this arm undergo catheter ablation for atrial fibrillation guided by unipolar QS-potential mapping. Intracardiac unipolar voltage mapping is performed to identify QS-potentials, which reflect epicardial-endocardial breakthrough sites. Ablation is delivered to these identified target sites in addition to standard pulmonary vein isolation.
Other: Conventional PVI Group
Participants in this arm undergo conventional pulmonary vein isolation for atrial fibrillation using standard bipolar voltage mapping. Ablation is performed to achieve electrical isolation of the pulmonary veins, without additional mapping-guided ablation beyond PVI.
Procedure: Conventional Pulmonary Vein Isolation
Participants in this arm undergo conventional pulmonary vein isolation for atrial fibrillation using standard bipolar voltage mapping. Ablation is performed to achieve electrical isolation of the pulmonary veins, without additional mapping-guided ablation beyond PVI.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Freedom from Atrial Fibrillation Recurrence at 3 Months Post Ablation
Time Frame: 3 months (from month 1 to month 6 post-ablation)
Freedom from any episode of atrial fibrillation (AF), atrial tachycardia (AT), or atrial flutter (AFL) lasting ≥30 seconds, as detected by electrocardiogram (ECG) or 24-hour Holter monitoring, after a 3-month blanking period following the ablation procedure.
3 months (from month 1 to month 6 post-ablation)

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Total ablation time
Time Frame: Intraoperative (on the day of the ablation procedure)
Total duration of radiofrequency energy delivery during the ablation procedure, measured in minutes. This includes all ablation applications (both pulmonary vein isolation and additional lesion sets) from the first to the last energy application.
Intraoperative (on the day of the ablation procedure)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

China National Center for Cardiovascular Diseases

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

June 20, 2026

Primary Completion (Estimated)

September 19, 2026

Study Completion (Estimated)

December 20, 2026

Study Registration Dates

First Submitted

June 2, 2026

First Submitted That Met QC Criteria

June 2, 2026

First Posted (Actual)

June 5, 2026

Study Record Updates

Last Update Posted (Actual)

June 5, 2026

Last Update Submitted That Met QC Criteria

June 2, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2026-3076

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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