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Efficacy & Safety of Dronedarone Versus Amiodarone for the Maintenance of Sinus Rhythm in Patients With Atrial Fibrillation (DIONYSOS)

This study has been completed.
Information provided by:
Sanofi Identifier:
First received: June 20, 2007
Last updated: February 15, 2010
Last verified: February 2010
The objective of this study is to compare the efficacy and safety of dronedarone to that of amiodarone for the treatment of patients with atrial fibrillation.

Condition Intervention Phase
Atrial Fibrillation
Drug: dronedarone (SR33589)
Drug: amiodarone
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Care Provider, Investigator)
Primary Purpose: Treatment
Official Title: Randomized Double Blind Trial to Evaluate the Efficacy and Safety of Dronedarone (400mg BID) Versus Amiodarone (600mg Daily for 28 Days, Then 200mg Daily Thereafter) for at Least 6 Months for the Maintenance of Sinus Rhythm in Patients With Atrial Fibrillation (AF)

Resource links provided by NLM:

Further study details as provided by Sanofi:

Primary Outcome Measures:
  • Treatment Failure [ Time Frame: minimum study duration is 6 months (+10 days); maximum is 15 months ]

Secondary Outcome Measures:
  • Occurrence of the Main Safety Endpoint (MSE) Defined as Thyroid, Hepatic, Pulmonary, Neurological, Skin, Eye, or Gastrointestinal Specific Treatment Emergent Events or Premature Study Drug Discontinuation Following Any Adverse Event [ Time Frame: minimum study duration is 6 months (+10 days); maximum is 15 months ]

Enrollment: 504
Study Start Date: June 2007
Study Completion Date: October 2008
Primary Completion Date: October 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Dronedarone 400mg bid
dronedarone 400mg tablets administered twice a day (bid) and matching over-encapsulated tablets of placebo of amiodarone 200mg
Drug: dronedarone (SR33589)
oral administration
Other Name: Multaq®
Active Comparator: Amiodarone 600mg/200mg od
over-encapsulated tablets of amiodarone 200mg (600mg daily for 28 days then 200mg daily) administered once daily (od) and matching placebo of dronedarone 400mg tablets
Drug: amiodarone
oral administration


Ages Eligible for Study:   21 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients with documented atrial fibrillation for more than 72 hours for whom cardioversion and antiarrhythmic treatment is indicated in the opinion of the investigator and under oral anticoagulation

Exclusion Criteria:

  • Contraindication to oral anticoagulation
  • Patient having received amiodarone in the past whatever the date (more than a total of twenty 200 mg tablets or more than 5 days intravenous)
  • Patients known to have chronic AF, patients with atrial flutter or paroxysmal atrial fibrillation
  • Severe congestive heart failure with New-York Heart Association (NYHA) class III or IV, severe bradycardia, high degree atrio-ventricular block, ongoing potentially dangerous symptoms when in AF such as angina pectoris, transient ischemic attacks, stroke, syncope, as judged by the investigator, first degree family history of sudden cardiac death below age 50 years in the absence of coronary heart disease, significant sinus node disease without a permanent pacemaker implanted
  • History of torsades de pointes or long QT syndrome or QT- or QTc-interval ≥500 msecs before randomization
  • Treatment with other class I or III antiarrhythmic drugs which cannot be discontinued
  • Dysthyroidism or other contraindication to amiodarone

The above information are not intended to contain all the considerations relevant to a patient's potential participation in a clinical trial.

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00489736

  Show 23 Study Locations
Sponsors and Collaborators
Study Director: International Clinical Development Sanofi
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: International Clinical Development, Clinical Study Director, sanofi-aventis Identifier: NCT00489736     History of Changes
Other Study ID Numbers: EFC4968
Study First Received: June 20, 2007
Results First Received: September 30, 2009
Last Updated: February 15, 2010

Keywords provided by Sanofi:
Atrial Fibrillation
sinus rhythm

Additional relevant MeSH terms:
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 processed this record on April 25, 2017