RF Lesion Monitoring With 8mm IntellaTip MiFi XP

November 14, 2015 updated by: Michael S. Lloyd, Emory University

Radiofrequency Ablation Lesion Monitoring Using Imbedded Micro-Electrodes Versus Standard Bipolar Electrograms

Abnormal heart rhythms or arrhythmias are often managed by a procedure in which a catheter is introduced into the heart. These catheters can then cauterize abnormally functioning portions of the heart muscle with the hope of returning the heart to a more effective rhythm. In the process of performing such a procedure, called a catheter ablation, an operator must be able to accurately sense electrical activity displayed on computer screens in different parts of the heart, provide sufficient localized energy to the abnormally behaving tissue (ideally without damaging uninvolved heart structures), and accurately reassess the electrical activity of the heart to ensure the spot in the heart has been cauterized.

When sensing electrical activity of the heart, specialized catheters produce recordings on a computer screen known as electrograms (EGM). To produce this recording conventional catheters commonly use a positive and negative electrode, from which the difference between the two provides the EGM. The distance between the two electrodes varies from device to device. The greater the distance between them, the less accurate the measurement of local electrical activity becomes. This may result in poorly localized or excessive use of energy that could be damaging to normal heart structures or put the patient at risk for the return or development of additional arrhythmias. The IntellaTip MiFi catheter has been constructed with a specialized sensing tip that uses "microelectrodes" that are relatively close in proximity (<1 mm apart) with the hope of improving the sensing capability of the device.

This study will analyze the signals obtained from this FDA-approved catheter in people undergoing a catheter ablation procedure. The study will examine signals after the procedure is finished and will not prolong or differ the process from a standard ablation procedure. The goal of this study is to determine the ability of the microelectrodes to distinguish ablated, or cauterized versus non-cauterized tissue.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

This trial is an operator-blinded, acute, single-visit observational trial in humans. Enrollment will include 25 patients undergoing a radiofrequency ablation procedure in which ablation of the cavotricuspid isthmus is planned. Electrogram characteristics of the small, imbedded pin electrodes will be compared to standard bipolar EGMs utilizing the ablation tip electrode and ring. Absolute voltage, voltage reduction, and frequency spectra will be examined before, during, and after ablation. EGM characteristics of standard and "ultra-local" recordings will be compared in their ability to accurately identify an effective RF lesion as defined below.

Study Type

Observational

Enrollment (Actual)

30

Contacts and Locations

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

Study Locations

  • United States
    • Georgia
      • Atlanta, Georgia, United States, 30322
        • Emory University 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

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

Enrollment will include 25 patients undergoing a radiofrequency ablation procedure in which ablation of the cavotricuspid isthmus is planned.

Description

Inclusion Criteria:

  • Any adult undergoing an atrial flutter ablation

Exclusion Criteria:

-

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

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Atrial flutter patients
Atrial flutter patients undergoing catheter ablation
Device: Catheter ablation
This is observational trial studying the effects of a standard intervention of a catheter ablation procedure.
Other Names:
  • 8mm IntellaTip MiFi XP ablation catheter

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Total bipolar electrogram amplitude using tip to ring and pin to pin configurations
Time Frame: Acute, averaged one hour during ablation. Measured postoperatively.
Acute, averaged one hour during ablation. Measured postoperatively.

Secondary Outcome Measures

Outcome Measure
Time Frame
Total number of seconds per isthmus ablation spent in excess of the post-hoc identified complete lesion time.
Time Frame: Acute, averaged one hour during ablation. Measured postoperatively
Acute, averaged one hour during ablation. Measured postoperatively

Collaborators and Investigators

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

Sponsor

Emory University

Collaborators

Boston Scientific Corporation

Investigators

  • Principal Investigator: Michael Lloyd, MD FHRS FACC, Emory University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Helpful Links

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

April 1, 2014

Primary Completion (Actual)

November 1, 2015

Study Completion (Actual)

November 1, 2015

Study Registration Dates

First Submitted

February 8, 2014

First Submitted That Met QC Criteria

March 15, 2014

First Posted (Estimate)

March 18, 2014

Study Record Updates

Last Update Posted (Estimate)

November 17, 2015

Last Update Submitted That Met QC Criteria

November 14, 2015

Last Verified

November 1, 2015

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • IRB00069674
  • ISRCRM90003 (Other Identifier: Other)

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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