Surgical or Catheter Ablation of Lone Atrial Fibrillation (AF) Patients (SCALAF)
|ClinicalTrials.gov Identifier: NCT00703157|
Recruitment Status : Terminated (Enrollments slowed down significantly, despite several attempts to re-launch.)
First Posted : June 23, 2008
Results First Posted : May 16, 2017
Last Update Posted : May 16, 2017
|Condition or disease||Intervention/treatment||Phase|
|Atrial Fibrillation||Procedure: Catheter Ablation Procedure: Surgical Ablation||Not Applicable|
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Title: Surgical or Catheter Ablation in patients with Lone Atrial Fibrillation: determination of acute and long term SUCCESS (SCALAF-success trial).
Background: Anti-arrhythmic drugs are used in daily practice to treat patients with paroxysmal idiopatic AF. Often the origin of the AF can be found in the muscle sleeves running up the pulmonary veins. Drug treatment is not always successful and prone to evoke negative side effects. The surgical MAZE procedure was applied in the past, but this is a time consuming, cumbersome technique, often associated with significant complications. Cardiac radio-frequency ablation offers an alternative, easy and less time consuming treatment: lesions prevent normal electrical wave front propagation and might stop the continuation of atrial fibrillation wave fronts. Ablation can be implemented by use of special catheters inserted via the groin or using the Medtronic Cardioblate® Surgical Ablation System applied via minimal invasive surgical techniques.
Purpose: Compare the effectiveness of pulmonary vein isolation achieved via catheter or via surgical ablation techniques to treat patients with paroxysmal lone AF.
Study design: A prospective, randomized multi-center interventional study.
Patients: Patients suffering from paroxysmal idiopatic AF (no associated or underlying structural heart disease) complying with following inclusion criteria:
- minimally one documented AF-episode in the last 6 months;
- refractory to at least 2 class I or III anti-arrhythmic drugs;
- age > 18 year
Intervention: Patients are randomized to either the surgical or the catheter ablation group and receive the indicated treatment. During the critical assessment period, the patients are weaned from anti-arrhythmic medication.
Primary endpoint: Reduction in AF occurrence measured by the AF-burden parameter in the critical period between 3 and 6 months post-ablation. AF burden is measured automatically by means of the Reveal XT, implanted at study enrolment to document the baseline characteristics.
- Failure of therapy requiring re-interventions;
- Duration, burden and costs of ablation procedures:
- Reduction in frequency, duration and level of severity of AF symptoms;
- Occurences of treatments of arrythmic episodes;
- Assessment of AF burden during follow-up period
- Symptoms associated with AF;
- Reduced necessity of anti-arrhythmic or anticoagulant medication;
- Left atrial dimensions and contractility
- Adverse events associated with the ablation therapy;
- Occurrence of other clinical adverse events (TIA, CVA, bleeds, tamponade, MI) at 3, 6, 12 and 24 months of follow up
- Mortality and hospitalisation
Risk assessment: Possible side effects : irregular heart rhythm, pericardial fluid, stroke, heart infarct, disturbances of the conduction system in the heart, local pain at the site of incisions, heart failure or reduced pump function of the heart.
Possible benefits: Regulation of the heart rhythm without applying MAZE procedure or opening of the thorax. Reduction or relief from symptoms associated with AF. Partial or complete reduction of anti-arrhythmic medication. Control of anti-coagulant medication. Improved quality of life for the patients.
Visits are planned at study entrance and Reveal XT implant (assessment at baseline, application of the ablation therapy), discharge from hospital, and at 3, 6, 12 and 24 months post-ablation.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||80 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||None (Open Label)|
|Official Title:||Surgical or Catheter Ablations in Patients With Lone Atrial Fibrillation: Determination of Acute and Long Term Success Rate (SCALAF Success Trial)|
|Study Start Date :||November 2007|
|Actual Primary Completion Date :||August 2015|
|Actual Study Completion Date :||November 2016|
Active Comparator: 1
Arm 1: Catheter Ablation
Procedure: Catheter Ablation
Patients undergoing left atrial circumferential pulmonary vein ostia ablation.
Active Comparator: 2
Arm 2: Surgical Ablation.
Procedure: Surgical Ablation
patients undergoing left atrial circumferential pulmonary vein ostia ablation via minimal invasive surgery.
- Change in AF Burden After Ablation Therapy Measured With REVEAL-XT Implantable Device. [ Time Frame: Baseline through 3-6 months post-ablation ]AF Burden is defined as the percentage of time during the follow-up period that a subject is in AF, as measured by the REVEAL-XT implantable device.
- Treatment Failures Requiring Redo or Alternative Therapy [ Time Frame: Time from procedure until 6 months post-ablation ]
- Number of Subjects With Adverse Events, Associated With the Ablation Procedure [ Time Frame: Time from procedure ]
- Mortality and Hospitalization [ Time Frame: Time from procedure until 24 months post-ablation ]
- Duration, Burden and Costs of Treatment Procedures [ Time Frame: Through 24 months post- ablation ]
- Reduced Number, Duration and Severity of AF Symptoms [ Time Frame: Through 24 months post-ablation ]
- Symptoms Associated With Atrial Arrhythmias [ Time Frame: Through 24 months post-ablation ]
- Occurences of Treatment of Arrhythmic Episodes [ Time Frame: Through 24 months post-ablation ]
- Assessment of AF Burden [ Time Frame: Through 24 months post-ablation ]
- Reduced Anti-arrhythmic Drug Requirement [ Time Frame: Through 24 months post-ablation ]
- Left Atrial Dimension and Contractility [ Time Frame: Through 24 months post-ablation ]
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00703157
|Zwolle, Netherlands, 8011 JW|
|Principal Investigator:||Hauw Sie, MD||Isala Klinieken, Zwolle|