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Assessing Arrhythmias After Ablation Using Implantable Recorders (ABACUS)

This study has been completed.
ClinicalTrials.gov Identifier:
First Posted: August 6, 2010
Last Update Posted: November 14, 2017
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
University of Pennsylvania
The purpose of this study is to determine if continuous monitoring using an implantable loop recorder (ie. a device that is placed just underneath the skin of the chest and monitors the heart rate and rhythm) for a year long period after atrial fibrillation ablation may be superior to the current conventional monitoring strategy used by us for determination of atrial fibrillation recurrence (ie. return of the abnormal heart rhythm) and/or arrythmia burden (ie. how long the abnormal rhythm continues or how often the rhythm occurs). Some data suggests that continuous monitoring over longer periods may be better in identifying recurrence of atrial fibrillation after ablation and thus assist in its overall management. The device being used for this study is the Reveal XT, which, is currently FDA approved for monitoring all varieties of cardiac rhythm disorders including atrial fibrillation.

Condition Intervention
Atrial Fibrillation Device: Reveal XT implantable loop recorder

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: Assessment of Arrhythmia Burden in Patients Undergoing Atrial Fibrillation Using an Implantable Loop Recorder (ILR) Versus Conventional Monitoring Strategy

Resource links provided by NLM:

Further study details as provided by University of Pennsylvania:

Primary Outcome Measures:
  • Arrhythmia Burden [ Time Frame: 12 months ]
    The primary outcome will be arrhythmia burden (atrial fibrillation and/or other atrial arrhythmias) after atrial fibrillation ablation over the initial 6 months and one year post-ablation as detected by the implantable loop recorder versus the conventional monitoring strategy.

Secondary Outcome Measures:
  • Detection of actionable events resulting in change of clinical care [ Time Frame: 12 months ]
    Change of clinical care include initiation of previously discontinued and/or new anti-arrhythmic drugs, decision for repeat ablation, hospitalization for arrhythmias, discontinuation or reinitiation of atrio-ventricular nodal blocking agents, discontinuation or reinitiation af anticoagulation after ablation and/or decision to implant a pacemaker and/or defibrillator.

  • Quality of Life Measures [ Time Frame: 12 months ]
    Quality of life measures will be achieved using the visual analog scale.

Enrollment: 44
Study Start Date: June 2012
Study Completion Date: January 2013
Primary Completion Date: August 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
No Intervention: Conventional Monitoring Strategy
Subjects will be monitored for 12 months using the conventional strategy which includes wearing a monitor over 3 separate 30-day periods over the first year post-ablation and daily pulse checks.
Reveal XT
Subjects will be monitored using the conventional monitoring strategy for the first 6 months post-ablation. During the next 6 months, subjects will be monitored using the data from the Reveal device, transmitted from home every 30 days.
Device: Reveal XT implantable loop recorder
All study participants will receive the Reveal XT implantable loop recorder immediately after completion of the ablation procedure.


Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Greater than 18 years
  • Undergoing ablation for atrial fibrillation at the University of Pennsylvania

Exclusion Criteria:

  • Patients with already implanted devices, including pacemakers, implantable cardiac defibrillators and cardiac resynchronization devices
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01176617

United States, Pennsylvania
University of Pennsylvania
Philadelphia, Pennsylvania, United States, 19014
Sponsors and Collaborators
University of Pennsylvania
Principal Investigator: Sanjay Dixit, MD University of Pennsylvania
  More Information

Responsible Party: University of Pennsylvania
ClinicalTrials.gov Identifier: NCT01176617     History of Changes
Other Study ID Numbers: UPenn811675
First Submitted: August 4, 2010
First Posted: August 6, 2010
Last Update Posted: November 14, 2017
Last Verified: June 2012

Keywords provided by University of Pennsylvania:
Atrial Fibrillation
Pulmonary Vein isolation

Additional relevant MeSH terms:
Atrial Fibrillation
Arrhythmias, Cardiac
Heart Diseases
Cardiovascular Diseases
Pathologic Processes