Comprehensive LEFt Atrial Appendage Occlusion With Rhythm Restoration (CLEAR)

July 10, 2026 updated by: Abbott Medical Devices
The objective of this clinical investigation is to evaluate the feasibility, safety, and effectiveness of a concomitant procedure involving the Volt PFA System and Amulet 2 device in patients indicated for both AF ablation and percutaneous LAAO.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

This clinical investigation is intended to evaluate the safety and feasibility of Abbott's Volt™ Pulsed Field Ablation (PFA) System (Volt PFA System) and Amulet™ 2 Left Atrial Appendage (LAA) occluder device (Amulet 2 device) in patients with non-valvular atrial fibrillation who are indicated for both atrial fibrillation (AF) ablation and LAA occlusion (LAAO)

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
240

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • 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 Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Belgium
    • B CAP R
      • Brussels, B CAP R, Belgium, 1090
        • Recruiting
        • UZ Brussel
  • Czechia
    • Czech Republic
      • Prague, Czech Republic, Czechia, 1500
        • Recruiting
        • Motol and Homolka University Hospital
  • Denmark
    • Copenha
      • Copenhagen, Copenha, Denmark, 2100
        • Recruiting
        • Rigshospitalet
  • Germany
    • Hesse
      • Frankfurt am Main, Hesse, Germany, 60389
        • Recruiting
        • Cardioangiologisches Centrum am Bethanien Krankenhaus
    • Schlesw
      • Lübeck, Schlesw, Germany, 23538
        • Recruiting
        • Universitatsklinikum Schleswig-Holstein - Campus Lubeck
    • State of Berlin
      • Berlin, State of Berlin, Germany, 13353
        • Recruiting
        • Deutsches Herzzentrum der Charité
  • Ireland
    • Dublin
      • Dublin, Dublin, Ireland, Dublin 7
        • Recruiting
        • Mater Private Hospital
  • Italy
    • Italy
      • Milan, Italy, Italy, 20138
        • Recruiting
        • Centro Cardiologico Monzino
    • Lombard
      • Milan, Lombard, Italy, 20162
        • Recruiting
        • ASST Grande Ospedale Metropolitano
  • Lithuania
    • Dzukija
      • Vilnius, Dzukija, Lithuania, 08406
        • Recruiting
        • Vilnius University hospital Santaros klinikos
  • Poland
      • Lodz, Poland
        • Not yet recruiting
        • Centralny Szpital Kliniczny Uniwersytetu
    • Silesian Voivodeship
      • Zabrze, Silesian Voivodeship, Poland, 41-800
        • Not yet recruiting
        • Slaskie Centrum Chorob Serca
  • Spain
    • Catalon
      • Barcelona, Catalon, Spain, 08025
        • Recruiting
        • Hospital de la Santa Creu i Sant Pau
    • Navarre
      • Pamplona, Navarre, Spain, 31008
        • Recruiting
        • Clinica Universidad de Navarra
  • United Kingdom
      • Brighton, United Kingdom
        • Not yet recruiting
        • Royal Sussex County Hospital
      • Oxford, United Kingdom
        • Not yet recruiting
        • John Radcliffe Hospital

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Subject must provide written informed consent prior to any clinical investigation-related procedure.
  • 18 years of age or older, or the age of legal consent
  • CHA2DS2-VASc score of ≥ 3 for women and ≥ 2 for men
  • Able to stop anticoagulation by 90 days post index procedure
  • Able to adhere to the protocol defined post-concomitant procedure pharmacologic regimen of OAC for at least 60 days followed by SAPT
  • Plans to undergo a catheter ablation procedure including PVI due to symptomatic, recurrent, drug-refractory PAF or PersAF
  • Documented symptomatic PAF or PersAF. Documentation requirements are as follows:

Paroxysmal:

  • Physician's note indicating recurrent self-terminating AF with ≥ 2 episodes of PAF within the 12 months prior to enrollment AND
  • One electrocardiographically documented PAF episode within 12 months prior to enrollment.

Persistent: Continuous AF sustained beyond 7 days and less than 1 year that is documented by

  • Physician's note, AND either
  • 24-hour Holter within 180 days prior to enrollment, showing continuous AF, OR

  • Two electrocardiograms (from any form of rhythm monitoring) showing continuous AF:

    • That are taken at least 7 days apart but less than 12 months apart
    • If electrograms are more than 12 months apart, there must be one or more Sinus Rhythm recordings in between or within 12 months prior to consent/enrollment
    • The most recent electrocardiogram must be within 180 days of enrollment.

NOTE: Documented evidence of the AF episode must either be continuous AF on a 12-lead ECG or include at least 30 seconds of continuous AF from another ECG device.

Exclusion Criteria:

  • Known contraindication or allergy to NOACs or aspirin, preventing use of the drugs post-procedure
  • Required to take P2Y12 platelet inhibitor after the study procedure (e.g., due to percutaneous coronary intervention)
  • Patients with heart prosthetic valves
  • Patient implanted with an inferior vena cava filter
  • Patients with left ventricular ejection fraction ≤30%
  • Patients with NYHA Class IV heart failure
  • Patients who have undergone any invasive intervention or surgery within 30 days prior to the index procedure (diagnostic catheterization is not within scope, however, percutaneous coronary intervention is within scope)
  • Patients who have experienced stroke or transient ischemic attack within 90 days prior to study procedure
  • Patients who have had previous attempt at LAA surgical or epicardial intervention (e.g., stapling, suturing, ligation, epicardial LAA management device)
  • Patients previously diagnosed long-standing persistent atrial fibrillation (Continuous AF greater than 1 year in duration)
  • Patients with arrhythmia due to reversible causes including thyroid disorders, acute alcohol intoxication, electrolyte imbalance, severe untreated sleep apnea, and other major surgical procedures within 90 days prior to the study procedure
  • Patients unable to receive heparin or an acceptable alternative to achieve adequate intra-procedural anticoagulation
  • Patients with a stent, constriction, or stenosis in a pulmonary vein
  • Patients with severe mitral regurgitation (regurgitant volume ≥ 60 mL/beat, regurgitant fraction ≥ 50%, and/or effective regurgitant orifice area ≥ 0.40cm2)
  • Patients with severe renal failure (estimated glomerular filtration rate <30 ml/min/1.73m2) or on chronic dialysis
  • Patients with severe pulmonary disease (e.g., restrictive pulmonary disease, constrictive or chronic obstructive pulmonary disease) or any other disease or malfunction of the lungs or respiratory system that produces severe chronic symptoms
  • Patients with hypertrophic cardiomyopathy (maximal LV wall thickness ≥ 15 mm in the absence of abnormal loading conditions such as hypertension or aortic stenosis)

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: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Treatment
Concomitant procedure utilizing the Volt PFA System and Amulet 2 device in patients indicated for both AF ablation and percutaneous LAAO implant.
Procedure: PVI Ablation
PVI Ablation with Pulsed Field Ablation
Device: Left Atrial Appendage Occluder Implant
Left atrial appendage occluder implant

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
LAA occlusion success determined by peri-device flow ≤5mm
Time Frame: From treatment through 3-month follow-up vists
The primary effectiveness outcome is LAA occlusion defined as no peri-device flow or peri-device flow ≤5mm based on Doppler color flow TEE/TOE at the 3-month follow-up visit as assessed by an independent core laboratory
From treatment through 3-month follow-up vists
Occurrence of specific adverse events between time of implant and 7 days post-procedure or hospital discharge, whichever was later
Time Frame: From implant of LAAO through ≤7 days post-procedure or hospital discharge, whichever is later

The primary safety outcome is defined as occurrence of one of the following between the time of implant and ≤7 days post-procedure or hospital discharge, whichever was later: death, ischemic stroke, systemic embolism, or device/procedure related complications requiring open cardiac surgery or major endovascular intervention

  • Includes pseudoaneurysm repair or AV fistula repair
  • Excludes percutaneous drainage of PE, snaring of embolized devices, thrombin injection or nonsurgical treatment of access site complications
From implant of LAAO through ≤7 days post-procedure or hospital discharge, whichever is later

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Abbott Medical Devices

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 (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
March 31, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
May 31, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
February 28, 2028

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
April 6, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 6, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
April 13, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
July 13, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 10, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
July 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • ABT-CIP-10617

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

Yes

product manufactured in and exported from the U.S.

Yes

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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