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Status unknownNCT02439424REACT-ICDUpdated Dec 23, 2016

The REACT-ICD Trial

A Phase 1/2 interventional study of Reactive ATP in Atrial Tachyarrhythmia and Atrial Fibrillation, sponsored by Hartford Hospital. Status unknown at 1 site in United States. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2016-12-23.

Sponsored by Hartford Hospital · Phase 1/2, Interventional, and Health services research

The sponsor has not verified this record recently (last verified Dec 2016), so the status shown — last known as Active, not recruiting — may be out of date.
Phase
Phase 1/2
Study type
Interventional
Enrollment
6
Allocation
Not applicable
Ages
18 Years and older
Sex
All
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Study summary

Recent advancements with implantable cardiac device technology include extensive diagnostic and therapeutic algorithms for prevention as well as termination of atrial tachyarrhythmias (ATA). Preventive atrial pacing (PAP) and a novel atrial antitachycardia pacing algorithm (Reactive ATP™) in conjunction with managed ventricular pacing (MVP) recently has been shown to reduce progression to permanent atrial fibrillation (AF) in pacemaker patients with intact atriovenous (AV) conduction and a history of ATA. Whether the use of Reactive ATP™ for reducing AF burden extends to patients with an implantable cardioverter defibrillator (ICD), who typically have structural heart disease and heart hailure (HF), is unknown.

Read the detailed description

Atrial tachyarrhythmias (ATA) and heart failure (HF), which are well-recognized causes of morbidity and mortality, are growing and concerning issues in our patient population. In patients implanted with a dual-chamber implantable cardioverter defibrillator (ICD), progression of paroxysmal to persistent or permanent atrial fibrillation (AF) has been documented. Because of the untoward consequences of AF, such as development/worsening of HF or thromboembolic events (stroke and myocardial infarction [MI]), prevention of permanent AF has the potential to improve quality of life, reduce hospitalizations, and decrease the complications associated with AF.

Recent advancements with implantable cardiac device technology include extensive diagnostic and therapeutic algorithms for prevention as well as termination of ATA. Preventive atrial pacing (PAP) and a novel atrial antitachycardia pacing algorithm (Reactive ATP™) in conjunction with managed ventricular pacing (MVP) recently has been shown to reduce progression to permanent AF in pacemaker patients with intact atriovenous (AV) conduction and a history of ATA. Results of that study suggested that Reactive ATP™ specifically was responsible for this effect. Whether the use of Reactive ATP™ for reducing AF burden extends to patients with an implantable cardioverter defibrillator (ICD), who typically have structural heart disease and HF, is unknown.

The aim of this study is to evaluate the effectiveness of atrial antitachycardia pacing (Reactive ATP) in patients implanted with either a dual-chamber or cardiac resynchronization therapy (CRT) ICD who have a history of ATA.

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Conditions studied

  • Atrial Tachyarrhythmia
  • Atrial Fibrillation
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In context

Atrial Fibrillation

3,870 studies on the registry are indexed under Atrial Fibrillation; 924 are open to participants now.

This study's enrollment of 6 is below the median of 144 across 2,380 interventional studies indexed under Atrial Fibrillation.

Browse Atrial Fibrillation studies →

Lead sponsor

Hartford Hospital is the lead sponsor of 101 studies on the registry; 19 are open to participants now.

Of its 12 completed or terminated interventional studies of FDA-regulated products, 5 (42%) have results posted.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • male and female patients
  • ≥18 years old (no upper age limit)
  • previously implanted with a Medtronic dual-chamber or CRT ICD with capability of atrial antitachycardia pacing; specifically, Reactive ATP™ at least 9 months previously (six months data collection and implant occurring at least 3 months previously to allow healing and establishment of stable sensing)
  • measured P wave in sinus rhythm of at least 0.8 mV
  • >=6 months AT/AF burden data available, either from CareLink® or in-office interrogation
  • >=1.0% AT/AF burden (hours in atrial fibrillation/total hours monitored) in the last 6 months
  • No change in antiarrhythmic drug therapy (Vaughan-Williams class I or III) in the last 6 months

Exclusion criteria

Exclusion Criteria:

  • Persistent or permanent AT/AF (AF burden >95%)
  • Cardioversion for atrial fibrillation or atrial flutter within the last 6 months, either intentional or as a result of a tachyarrhythmia therapy
  • Ablation for atrial fibrillation or atrial flutter within the last 9 months (6 months data collection following a 3 month blanking period post procedure)
  • Reactive ATP™ previously programmed on
  • Measured P waves in sinus rhythm consistently \<0.8 mV on repeat measurements.
  • Unresolved artifactual AT/AF detection due to far-field R wave or other oversensing
  • Expected generator change or other device surgery within six months
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Study design

Phase
Phase 1 / Phase 2
Primary purpose
Health services research
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
6 participants (actual)

Study arms

  • Experimental
    Reactive ATP

    all enrolled subjects will have the Reactive ATP feature in their ICD turned "on"

    Device: Reactive ATP

Interventions

  • DeviceReactive ATP

    Reactive ATP turned to "on"

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What researchers measure

Primary outcomes

  1. atrial fibrillation burden

    % of time in atrial fibrillation = time in atrial fibrillation (over 6 months of study) / 6 months

    Time frame: 6 months

Secondary outcomes

  1. Persistent/permanent atrial fibrillation

    number/percentage of patients in persistent (7 days) or permanent atrial fibrillation

    Time frame: 6 months

  2. cardioversion

    number/percentage of patients who underwent cardioversion

    Time frame: 6 months

  3. cardiovascular hospitalization

    number/percentage of patients who were hospitalized for cardiac-related issues

    Time frame: 6 months

  4. percentage of ventricular pacing

    percentage of ventricular beats that are paced by the ICD

    Time frame: 6 months

  5. Ventricular tachycardia/Ventricular fibribilation ICD therapies

    number of appropriate or inappropriate therapies (ATP \[antitachycardiac pacing\] or shock)

    Time frame: 6 months

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Study locations

1 site
  • Hartford Hospital
    Hartford, Connecticut 06102, United States
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References and documents

Publications

  • Swerdlow CD, Schsls W, Dijkman B, Jung W, Sheth NV, Olson WH, Gunderson BD. Detection of atrial fibrillation and flutter by a dual-chamber implantable cardioverter-defibrillator. For the Worldwide Jewel AF Investigators. Circulation. 2000 Feb 29;101(8):878-85. doi: 10.1161/01.cir.101.8.878. PubMed 10694527 ↗
  • Lampe B, Hammerstingl C, Schwab JO, Mellert F, Stoffel-Wagner B, Grigull A, Fimmers R, Maisch B, Nickenig G, Lewalter T, Yang A. Adverse effects of permanent atrial fibrillation on heart failure in patients with preserved left ventricular function and chronic right apical pacing for complete heart block. Clin Res Cardiol. 2012 Oct;101(10):829-36. doi: 10.1007/s00392-012-0468-7. Epub 2012 May 16. PubMed 22588842 ↗
  • Israel CW, Gronefeld G, Ehrlich JR, Li YG, Hohnloser SH. Long-term risk of recurrent atrial fibrillation as documented by an implantable monitoring device: implications for optimal patient care. J Am Coll Cardiol. 2004 Jan 7;43(1):47-52. doi: 10.1016/j.jacc.2003.08.027. PubMed 14715182 ↗
  • Boriani G, Padeletti L, Santini M, Gulizia M, Capucci A, Botto G, Ricci R, Molon G, Accogli M, Vicentini A, Biffi M, Vimercati M, Grammatico A. Predictors of atrial antitachycardia pacing efficacy in patients affected by brady-tachy form of sick sinus syndrome and implanted with a DDDRP device. J Cardiovasc Electrophysiol. 2005 Jul;16(7):714-23. doi: 10.1111/j.1540-8167.2005.40716.x. PubMed 16050828 ↗
  • Israel CW, Ehrlich JR, Gronefeld G, Klesius A, Lawo T, Lemke B, Hohnloser SH. Prevalence, characteristics and clinical implications of regular atrial tachyarrhythmias in patients with atrial fibrillation: insights from a study using a new implantable device. J Am Coll Cardiol. 2001 Aug;38(2):355-63. doi: 10.1016/s0735-1097(01)01351-1. PubMed 11499724 ↗
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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Dec 23, 2016, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT02439424
Lead sponsor
Hartford Hospital
Responsible party
Sponsor
First posted
May 8, 2015
Start date
Dec 2015
Primary completion
Mar 2017 (estimated)
Completion
Mar 2017 (estimated)
Last update
Dec 23, 2016

Study contacts

Steven Zweibel, MD
principal investigator · Hartford HealthCare

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is status unknown, as verified in Dec 2016. You cannot join it, but the record below documents what was studied.

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