Anti-arrhythmic Medication v. MRI-Merge Ablation in the Treatment of Ventricular Tachycardia

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. Identifier: NCT00721032
Recruitment Status : Withdrawn (PI left the institution)
First Posted : July 23, 2008
Last Update Posted : May 10, 2017
Information provided by (Responsible Party):
Johns Hopkins University

Brief Summary:

Ventricular tachycardia (VT) is a morbid arrhythmia responsible for many sudden deaths and ICD shocks. Despite much progress in the treatment of arrhythmia, VT remains a therapeutic challenge. Most patients with VT have an implantable cardioverter defibrillator (ICD) for secondary prevention of sudden cardiac death, however, an ICD merely treats VT, it does not prevent VT. In patients with recurrent VT and ICD shocks, two strategies are available to decrease the burden of VT. The first is antiarrhythmic drugs, and the second is VT ablation. The aim of this study is to compare the efficacy of antiarrhythmic drugs and VT ablation guided by MRI. VT can sometimes be suppressed with antiarrhythmic medications, however, these are often ineffective, and carry a high burden of side effects. Many forms of VT can be cured by selective destruction of critical electrical pathways with catheter ablation. A major limitation in the ablation of VT, however, is the time required to localize scar tissue and important pathways for targeting of lesions. Magnetic resonance imaging can now obtain reliable images of scar location within the ventricles. Recent advances in electroanatomical mapping systems allow operators to import pre-acquired images into the mapping system. The aim of this study is to examine the feasibility of importing historic MRI scar maps of the ventricles into the electroanatomical system and using such images to guide catheter ablation, as compared to antiarrhythmic drug suppression of VT. We suspect that MRI guidance will be especially useful in patients with "unstable" VT, i.e. VT that causes an abrupt drop in blood pressure, and thus cannot be maintained in the electrophysiology (EP) lab for mapping and entertainment purposes. Patients referred for VT ablation have ICDs. Through previously completed animal work (Circulation 2004; 110(5): 475-82) and a human trial (2006 Sep 19;114(12):1277-84) we have demonstrated the safety of MRI in the setting of pacemakers and implantable defibrillators using appropriate precautions. Through careful device programming and using MRI sequences with limited energy exposure (specific absorption rate < 2 W/kg) we will study the pre procedural myocardial anatomy of patients enrolled into this study.

The primary endpoint will be lack of VT documented by implantable defibrillator (when present) interrogation or Holter monitoring 6 months post ablation. The secondary endpoints will be comparison of inducible arrhythmia at the end of the procedure, procedure time, comparison of endocardial voltage mapping to scar on delayed enhancement MRI images, and complications in each study arm.

Condition or disease Intervention/treatment Phase
Ventricular Tachycardia Procedure: MRI guided VT ablation Drug: Increased dose of amiodarone Not Applicable

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 0 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Anti-arrhythmic Medication v. MRI-Merge Ablation in the Treatment of Ventricular Tachycardia
Study Start Date : June 2012
Estimated Primary Completion Date : August 2015
Estimated Study Completion Date : August 2015

Resource links provided by the National Library of Medicine

Drug Information available for: Amiodarone

Arm Intervention/treatment
Experimental: 1
Magnetic resonance imaging (MRI)-guided ablation of ventricular tachycardia.
Procedure: MRI guided VT ablation
Magnetic resonance imaging (MRI)-guided ablation of ventricular tachycardia (VT)

Active Comparator: 2
Anti-arrhythmic group.
Drug: Increased dose of amiodarone

Increase the dose of amiodarone according to the following scheme:

current dose -> new dose 100 once daily (QD) -> 200 QD; 200 QD -> 400 QD; 300 QD -> 600 QD; 400 QD -> 600 QD

Primary Outcome Measures :
  1. Freedom from ventricular tachycardia documented by implantable defibrillator cardioverter 6 months post ablation. [ Time Frame: 6 months ]

Secondary Outcome Measures :
  1. inducible arrhythmia at the end of the procedure, [ Time Frame: During procedure ]
  2. Procedure time [ Time Frame: During procedure ]
  3. Comparison of endocardial voltage mapping to scar on delayed enhancement MRI images [ Time Frame: During procedure ]
  4. Complications of the procedure [ Time Frame: 30 days following procedure ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 99 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No


  • Current treatment with amiodarone
  • Ischemic or non-ischemic cardiomyopathy
  • Monomorphic ventricular tachycardia at any cycle length, with > 1 occurrence of the same cycle length and morphology, at least one episode needs to be of sufficient duration to result in a shock.
  • No contraindication to up titration of meds or to VT radiofrequency ablation (RFA)


  • Primary antiarrhythmic medication other than amiodarone
  • Amiodarone at dose of 600 mg daily or higher
  • Polymorphic VT as culprit rhythm
  • History of metal exposure (welding)
  • Pregnant women
  • Recent myocardial infarction
  • Planned coronary revascularization
  • Implantable cardiac devices not previously tested for safety in the setting of MRI
  • Glomerular Filtration Rate (GFR) < 30 ml/min

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 identifier (NCT number): NCT00721032

United States, Oregon
Oregon Health & Science University
Portland, Oregon, United States, 97239
Sponsors and Collaborators
Johns Hopkins University

Responsible Party: Johns Hopkins University Identifier: NCT00721032     History of Changes
Other Study ID Numbers: NA_00011012
First Posted: July 23, 2008    Key Record Dates
Last Update Posted: May 10, 2017
Last Verified: May 2017

Keywords provided by Johns Hopkins University:
Ventricular tachycardia (VT)
Implantable cardioverter-defibrillator (ICD)
Electrophysiology study

Additional relevant MeSH terms:
Tachycardia, Ventricular
Arrhythmias, Cardiac
Heart Diseases
Cardiovascular Diseases
Pathologic Processes
Anti-Arrhythmia Agents
Vasodilator Agents
Potassium Channel Blockers
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action
Sodium Channel Blockers
Cytochrome P-450 CYP1A2 Inhibitors
Cytochrome P-450 Enzyme Inhibitors
Enzyme Inhibitors
Cytochrome P-450 CYP2C9 Inhibitors
Cytochrome P-450 CYP2D6 Inhibitors
Cytochrome P-450 CYP3A Inhibitors