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High Intensity Focused Ultrasound (HIFU) Ablation System Study

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: NCT00392106
Recruitment Status : Suspended (voluntarily by Sponsor to investigate an anticipated SAE)
First Posted : October 25, 2006
Last Update Posted : June 17, 2008
Information provided by:
ProRhythm, Inc.

Brief Summary:
The purpose of this study is to determine if the HIFU Pulmonary Vein Ablation System is effective in the treatment of paroxysmal Atrial Fibrillation compared to the control of best medical therapy with FDA approved antiarrhythmic drugs.

Condition or disease Intervention/treatment Phase
Atrial Fibrillation Drug: propafenone Drug: flecainide Drug: dofetilide Drug: sotolol Device: Pulmonary vein ablation Drug: Amiodarone Phase 3

Detailed Description:

Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia affecting an estimated 2.2 million persons in the United States (US). In addition to being debilitating, AF has been identified as a leading risk factor for stroke. AF is often associated with structural heart disease, but a substantial number of AF patients have little or no detectable structural heart disease. A patient with AF is up to 5 times more likely to have a stroke than the general population.

Recently, it has been demonstrated that for a significant portion of AF patients (80% - 95 %) the arrhythmia originates in one of the four pulmonary veins (PV's). Furthermore, it has been shown that isolation of this arrhythmia by ablation can, in the majority of patients (50-70%), eliminate or markedly reduce episodes of AF. Currently, there are a number of modalities being investigated to treat AF. They include radiofrequency, laser, thermal, cryo, microwave, and ultrasound ablation of targeted areas in the atrium and/or PVs.

Comparison(s): Clinical success of High Intensity Focused Ultrasound (HIFU) Ablation for Pulmonary Vein Isolation in the treatment of Atrial Fibrillation, compared to medical therapy with anti-arrhythmic drugs (AADs).

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 240 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Study of Focused Circumferential UltraSound for the Treatment of Atrial Fibrillation
Study Start Date : April 2006
Estimated Primary Completion Date : December 2010
Estimated Study Completion Date : June 2011

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Active Comparator: Control
Class I or III anti-arrhythmic drug for the treatment of AF
Drug: propafenone
Anti-arrhythmic drug prescribed for treatment of atrial fibrillation
Other Name: Rhyhmol

Drug: flecainide
Anti-arrhythmic drug prescribed for the treatment of Atrial fibrillation
Other Name: Tambocor

Drug: dofetilide
Anti-arrhythmic drug prescribed for treatment of atrial fibrillation
Other Name: Tikosyn

Drug: sotolol
Anti-arrhythmic Drug prescribed for treatment of Atrial Fibrillation
Other Name: Betapace

Drug: Amiodarone
Anti-arrhythmic Drug prescribed for the treatment of Atrial Fibrillation
Other Name: Pacerone

Experimental: Treatment
Pulmonary vein ablation with HIFU
Device: Pulmonary vein ablation
Electrical isolation of pulmonary vein with high-intensity focused ultrasound
Other Name: Left atrial ablation

Primary Outcome Measures :
  1. Acute treatment with elimination of AF episodes [ Time Frame: 12 months ]
  2. Death, stroke, and hospitalization for recurrence of AF [ Time Frame: within 12 months of treatment ]

Secondary Outcome Measures :
  1. Acute treatment success [ Time Frame: 60 days ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Documented atrial fibrillation
  • Failed or intolerant to at least 1 anti-arrhythmic drug
  • Able to take anti-coagulant therapy
  • Able to complete screening tests required for inclusion/exclusion criteria
  • Able to take at least 1 approved anti-arrhythmic drug
  • Not pregnant
  • Available for follow-up for at least 12 months

Exclusion Criteria:

  • Persistent or permanent atrial fibrillation
  • Mitral disease
  • Prior surgical treatment for atrial fibrillation
  • Ablation for treatment of atrial fibrillation within 6 months
  • Severe left ventricular hypertrophy
  • Known untreated coagulopathy
  • Unstable angina
  • Prior stroke
  • Uncontrolled heart failure
  • Secondary causes of atrial fibrillation
  • Uncorrected hyperthyroidism within 12 months
  • Pulmonary embolism within 6 months
  • Pneumonia or acute pulmonary disease within 3 months
  • Pacemaker/ICD
  • High risk for esophageal disease
  • Currently enrolled in investigational drug or device study

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): NCT00392106

Show Show 21 study locations
Sponsors and Collaborators
ProRhythm, Inc.
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Principal Investigator: Warren Jackman, MD Oklahoma University Health Sciences Center
Principal Investigator: Hugh Calkins, MD Johns Hopkins Medical Center
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Responsible Party: Reinhard Warnking, President and CEO, ProRhythm, Inc. Identifier: NCT00392106    
Other Study ID Numbers: CLIN-003
First Posted: October 25, 2006    Key Record Dates
Last Update Posted: June 17, 2008
Last Verified: June 2008
Keywords provided by ProRhythm, Inc.:
atrial fibrillation
AF ablation
antiarrhythmic agent
catheter ablation
pulmonary veins
Additional relevant MeSH terms:
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Atrial Fibrillation
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
Voltage-Gated Sodium Channel Blockers