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The Contact PVI Study: Use of Tissue Contact Data to Guide Atrial Fibrillation Ablation

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified June 2012 by Dr Michael Jones, Oxford University Hospitals NHS Trust.
Recruitment status was:  Recruiting
Information provided by (Responsible Party):
Dr Michael Jones, Oxford University Hospitals NHS Trust Identifier:
First received: June 25, 2012
Last updated: June 26, 2012
Last verified: June 2012

This study aims to investigate the benefit of a new impedance-based computer software application during routine catheter ablation for atrial fibrillation, to see if this information improves short and long term electrical disconnection of the pulmonary veins. This study will be a single blind prospective randomised control trial in patients undergoing AF ablation. Study participants will be randomly assigned to undergo parts of their pulmonary vein ablation with, and parts of their ablation without tissue contact data displayed for the doctor performing the ablation to see. The pulmonary veins will then be studied at the end of the procedure, and at any repeat procedure in the future, to look for a difference in the recovery rate of the ablations performed using contact data, compared to those ablations performed without the use of this contact data. If a reduction in tissue recovery is achieved through the use of this tissue contact data, it may lead in the future to a reduced need for repeat ablation procedures, and better outcomes for patients.

The investigators hypothesise that the use of the Ensite™ Contact™ ECI data will reduce the recovery of conduction, and promote long-term pulmonary vein isolation in patients undergoing left atrial ablation for atrial fibrillation.

Condition Intervention Phase
Atrial Fibrillation
Procedure: ablation
Procedure: RF ablation
Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single Blind (Care Provider)
Primary Purpose: Treatment
Official Title: The Contact-PVI Study - Does Assessment of Tissue Contact During RF Ablation Using the St. Jude Medical™ Ensite™ Contact™ System Increase Rates of Long-term Pulmonary Vein Isolation? A Prospective Randomised Study

Resource links provided by NLM:

Further study details as provided by Dr Michael Jones, Oxford University Hospitals NHS Trust:

Primary Outcome Measures:
  • The primary outcome measure will be the proportion (%) of pulmonary vein pairs found to be reconnected electrically to the left atrium at a subsequent redo ablation procedure [ Time Frame: 6 months ]

Secondary Outcome Measures:
  • Proportion of acute venous electrical reconnections [ Time Frame: acute (intra-procedure) ]
    proportion of pulmonary veins found to be electrically reconnected to the left atrium at the end of the index procedure

  • touch-up ablation requirements [ Time Frame: acute (intra-procedure) ]
    proportion of veins requiring additional ablation after initial successful isolation, at the end of the index procedure

  • procedure time [ Time Frame: acute ]
    duration of procedure

  • RF time [ Time Frame: acute (intra-procedure) ]
    total amount of radiofrequency ablation required

  • anatomical location of reconnections at repeat procedure [ Time Frame: at repeat ablation procerdure (6-12 months post index ablation procedure) ]
    anatomical location of electrical reconnections in pulmonary vein antra, as measured at a repeat ablation procedure

  • amount of RF required to achieve re-isolation at repeat ablation procedure [ Time Frame: at repeat ablation procedure (6-12 months post-index ablation procedure) ]
    total time of RF delivery required to re-isolate the reconnected pulmonary veins at a repeat ablation procedure

  • complications [ Time Frame: acute and subacute (intra-procedure, and during entire follow-up period) ]
    procedure-related complications

Estimated Enrollment: 156
Study Start Date: January 2012
Estimated Study Completion Date: December 2013
Estimated Primary Completion Date: December 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Contact ECI active Procedure: ablation
RF ablation to the left atrium of the heart, guided by ECI-contact information (active arm)
Other Names:
  • Irrigated RF ablation
  • RF ablation
  • Percutaneous transvenous catheter ablation
Placebo Comparator: Contact information deactivated
RF ablation without contact data
Procedure: RF ablation
RF ablation to the left atrium of the heart, without the use of ECI-contact information (control arm)
Other Names:
  • Irrigated RF ablation
  • Percutaneous transvenous catheter ablation


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

Inclusion Criteria:

  1. Participant is undergoing de novo pulmonary vein isolation procedure.
  2. Participant is willing and able to give informed consent for participation in the study.
  3. Male or Female, ≥18 years of age.

Exclusion Criteria:

  1. Previous percutaneous or open surgical procedure involving the left atrium
  2. Pregnancy (current or currently planning)
  Contacts and Locations
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Please refer to this study by its identifier: NCT01629056

Contact: Michael A Jones, MBBS +441865740406 ext 740406
Contact: Timothy R Betts, MBCHB PhD +441865220256 ext 220256

United Kingdom
John Radcliffe Hospital Recruiting
Headington, Oxfordshire, United Kingdom, Ox39DU
Contact: michael a jones, MBBS    +441586740406 ext 740406   
Sponsors and Collaborators
Oxford University Hospitals NHS Trust
Principal Investigator: Michael A Jones, MBBS Oxford University Hospitals NHS Trust
Study Director: Tim R Betts, MbCHb PhD Oxford University Hospitals NHS Trust
  More Information

Responsible Party: Dr Michael Jones, Electrophysiology research fellow, Oxford University Hospitals NHS Trust Identifier: NCT01629056     History of Changes
Other Study ID Numbers: 77431/244334/1/228
11/SC/0398 ( Other Identifier: Oxford C NRES Committee South Central )
Study First Received: June 25, 2012
Last Updated: June 26, 2012

Keywords provided by Dr Michael Jones, Oxford University Hospitals NHS Trust:
atrial fibrillation

Additional relevant MeSH terms:
Atrial Fibrillation
Arrhythmias, Cardiac
Heart Diseases
Cardiovascular Diseases
Pathologic Processes processed this record on May 25, 2017