Catheter Ablation Compared With Pharmacological Therapy for Atrial Fibrillation (CAPTAF Trial)
Information source: Uppsala University Hospital
ClinicalTrials.gov processed this data on August 23, 2015 Link to the current ClinicalTrials.gov record.
Condition(s) targeted: Atrial Fibrillation; Quality of Life
Intervention: Catheterablation (Device); Amiodarone (Drug); Sotalol (Drug); Flecainide (Drug); Propafenone (Drug); Disopyramide (Drug); Dronedarone (Drug)
Phase: N/A
Status: Active, not recruiting
Sponsored by: Uppsala University Hospital Official(s) and/or principal investigator(s): Carina M Blomström Lundqvist, Professor, Principal Investigator, Affiliation: Department of Cardiology, University Hospital in Uppsala
Summary
The objective is to compare the efficacy of 2 treatment strategies, catheter ablation of
atrial fibrillation versus optimized pharmacological therapy, in patients with symptomatic
atrial fibrillation.
It is a randomized, prospective, controlled, open-label multicentre, parallel-group study
including 116 patients. Inclusion criteria are patients aged 30-70 years with symptoms
related to atrial fibrillation and who have failed or been intolerant to at least one
anti-arrhythmic drug, with at least one atrial fibrillation episode documented on ECG during
the previous 12 months and at least one symptomatic episode during the previous 2 months or
at least 2 symptomatic episodes of persistent AF in the previous 12 months.
Main exclusion criteria are patients who have tested 2 or more anti-arrhythmic drugs for
rhythm control, uncontrolled hypertension, valvular disease requiring anticoagulation,
planned valve surgery within 2 years, contraindication to treatment with anticoagulants,
heart failure, left atrial diameter > 60 mm, unstable angina or acute myocardial infarction
within the last 3 months, cardiac revascularization procedure within the last 6 months,
prior cardiac surgery or planned cardiac corrective surgery within 1 year, prior AF ablation
procedure.
The primary endpoint is general health-related quality of life at 12 months follow-up. The
main secondary endpoints are morbidity and mortality as composite outcome, cardiovascular
hospitalization, symptoms, heart failure, left atrial and ventricular function and
diameters, exercise capacity, health care economics, rhythm, atrial fibrillation burden,
successful versus failed treatment, safety and "cross-overs" over time.
Patients will receive a cardiac monitor, implanted subcutaneously, which will monitor the
heart rhythm during a two month "Run-in" period, for the definition of the basic atrial
fibrillation burden. Patients will be randomly assigned to an antiarrhythmic drug (for
rhythm or rate control) or to left atrial catheter ablation. Evaluation of outcome is at 12,
24, 36 and 48 months of follow-up, while health economy will be evaluated at 24 and 48
months of follow-up.. In case of documented disease progression or unacceptable toxicity,
subjects will be switched to the alternative regimen. The main statistical analysis of the
primary endpoint will be based on the intention-to-treat population. The trial duration is
48 months.
Clinical Details
Official title: Catheter Ablation Compared With Pharmacological Therapy for Atrial Fibrillation - a Randomized Multicentre Study Comparing Atrial Fibrillation Ablation Strategy With Optimized Conventional Pharmacological Strategy After 12 Months Follow-up.
Study design: Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment
Primary outcome: quality of life
Secondary outcome: atrial fibrillation burdenComposite of morbidity Hospitalization Quality of Life Health care use and economy Success of treatment Physical capacity Atrial area and function Adverse events Recurrence of episodes of AF lasting at least one minute. Success/failure of treatment.
Detailed description:
It is a randomized, open-label, multi-centre trial in which patients with symptomatic
paroxysmal or persistent atrial fibrillation will be randomized to treatment with either
catheter ablation for pulmonary vein isolation or optimized conventional pharmacological
therapy. Patients will receive an implantable cardiac monitor, Reveal XT, implanted
subcutaneously, before a two month "Run-in" period from which the basic atrial fibrillation
burden will be defined, which will provide an objective basis to assess the AF burden for 3
years.
After initiation of randomized therapy, patients will be followed at 3, 6, 9, 12, 18, 24,
30, 36 and 48 months. In case of intolerable symptomatic atrial fibrillation despite
allocated treatment, subjects will be switched to the alternative regimen, on patient's
request.
The ablation will consist of pulmonary vein isolation for both paroxysmal and persistent
atrial fibrillation. A linear lesion at the left atrial roof is optional for patients with
recurrence after a first procedure or primarily for patients with persistent atrial
fibrillation only. A second ablation procedure may be undertaken at earliest 3 months after
the first procedure, if symptoms persists or recurs. Epicardial off-pump ablation may be
offered after failed attempts of transvenous catheter ablation at earliest 3 months after
latest procedure. If the second transvenous ablation procedure fails, patients may be
offered i) a third transvenous ablation procedure or ii) an epicardial off-pump procedure.
In case the patient declines a third intervention despite recurrence, the patient should
continue on the same anti-arrhythmic drugs. If new previously untested drugs are prescribed,
the patient will be defined as a change of treatment (and failed ablation). Ablation may be
performed using radiofrequency energy with irrigated tip or with cryo-energy using the
Arctic Front™ Cardiac CryoAblation Catheter. A complete pulmonary vein isolation will be
defined by documenting PV entrance block in each vein using a circular mapping catheter.
Anti-arrhythmic drugs remaining to be tested for rate and rhythm control may include
previously tested tolerable antiarrhythmic drugs if dosages were inadequate. Optimized
anti-arrhythmic drug therapy includes testing of all available anti-arrhythmic drugs at
adequate dosages, including amiodarone 600 mg once daily for 7-10 days, and 100-200 mg once
daily thereafter; sotalol: 80-160 mg twice daily; flecainide 100 to 150 mg twice daily or
the entire dose as slow-release formula once daily; propafenone 300 mg twice daily; and
disopyramide 250-375mg twice daily, and potentially new antiarrhythmic drugs commercially
available during the study period.
A monitor will verify that data recorded on the procedure forms are correct through
quarterly communication, review of catheterization reports and medical records. In
accordance with applicable regulations a monitor (study nurse from Uppsala) will contact
the site prior to the start of the study to review with the site staff protocol, study
requirements and their responsibilities to satisfy study requirements, if needed. When
reviewing data collection procedures the discussion will also include identification,
agreement and documentation of data items for which the case record forms (CRF), patient
files (paper or database), tracings of investigations, and questionnaires, will serve a
source document. The investigator and the head of the medical institution agrees should
allow the monitor direct access to all relevant documents whenever needed and in an event of
an audit. To ensure compliance the monitor may conduct a quality assurance audit, which can
occur at any time during or after completion of the study.
The Biometrics section at Uppsala Clinical Research Centre is responsible for the Data
Management. All data will be recorded in the CRFs and entered via eCRF directly into a web
based data capturing system except for electronically available data that will be loaded
directly into the study database. Each investigational site will have authorized site
personnel responsible for entering the data, as well as for changing and correcting the data
according to instructions provided by Uppsala Clinical Research Centre (UCR) and the
coordinating centre. All changes will be tracked by an audit trail. The site specific
investigator will sign the eCRF electronically when the data have been reviewed and edited,
and Source Data Verification has been performed.
The Database Closure will be performed in three steps, the first one when all data from the
first 12 months are entered, the second one when all data from the 24 months period are
entered and the third when the complete study period of 48 months are entered. All datasets
used for the 12- and 24 months analyses will be locked separately. Procedures: When all data
are entered into the database and all queries solved, the Database Closure procedures will
start.
Complications are defined as acute if occurring within 1 week after initialized therapy, and
late if occurring one week after initialized therapy. All "Serious adverse events" should be
documented on the "Adverse events Form" AND "Serious adverse events Form". All " Adverse
events" should be documented in the "Adverse events Form". All events which are part of
performing a catheterization procedure will be reported. All serious unanticipated events
whether or not they are considered to be related to the procedure but which have some
association with the catheterization either by timing or physiology, will be reported. Other
bleedings than major bleeding events should be reported as minor bleeds. All events related
to pharmacological therapy will be reported.
Procedural complications are defined as those arising during or within 1 month of the
procedure, including death, major bleeding, vascular injury, cerebrovascular accident,
myocardial infarction, pericardial effusion with or without tamponade, venous or systemic
embolism, phrenic nerve paralysis, and heart block. Events occurring later than 1 month
after the procedure and defined as related to the procedure are pulmonary vein stenosis,
tamponade, retroperitoneal haematoma, and atrio-esophageal fistula (see below).
Relation to Device Procedure or drug, Intensity, Outcome and Actions taken will be described
according to international regulations.
Statistical methods. All continuous variables will be presented per treatment group using
descriptive statistics by mean, SD, max and min values, in addition medians, 25th and 75th
percentiles will be presented when suitable.
The analysis of mean change in the primary endpoint will be two-sided and performed as an
unpaired t-test at 5% significance level. The difference between the treatment groups with
corresponding two-sided 95% confidence interval based on a normal approximation will be
presented. The continuous secondary endpoints will be analyzed in the same way as the
primary endpoint, but the results will be interpreted descriptively. Kaplan-Meier estimates
and log-rank test will be used to determine the occurrence of the secondary endpoints over
time. All categorical secondary endpoints will be compared between treatment groups with
frequency tables and Fisher's Exact Test including 95% confidence intervals where possible.
Adverse Events will be summarized per treatment group by body system/system organ class,
preferred terms, intensity, seriousness and relationship. Laboratory data for efficacy will
be presented in mean change tables.
The null hypothesis (H0) is that the difference in the mean change from baseline to 12
months after baseline in General Health between the two treatments is zero;- mean change for
the treatment group catheter ablation (μ 1) and - mean change for the treatment group
optimized conventional pharmacological therapy (μ 2) Safety - All randomized patients will
be included in the safety analysis. Only observed observations are used in the safety
analysis.
Intention to treat (ITT) - All randomized patients. The main analysis will be performed on
the ITT-population.
Per protocol (PP) - All randomized patients completing the study treatment period of 12
months without any major protocol violation (for example ineligibility, early withdrawals,
poor compliance).
A subgroup analysis will determine whether sinus rhythm obtained by AF ablation is superior
to sinus rhythm obtained by pharmacological therapy for rate and/or rhythm control. In
addition a comparison will be done between patients with sinus rhythm and patients with
atrial fibrillation irrespective of allocated therapy. Both analyses will be performed with
regard to quality of life, morbidity (composite, see secondary endpoint 1), cardiovascular
hospitalizations, exercise/ physical capacity, safety, and health economy at 12 and 24
months.
All continuous variables will be presented per treatment group using descriptive statistics
by mean, standard deviation, max and min values, in addition medians, 25th and 75th
percentiles will be presented when suitable. The analysis of mean change in the primary
endpoint will be two-sided and performed as an unpaired t-test at 5% significance level. The
difference between the treatment groups with corresponding two-sided 95% confidence interval
based on a normal approximation will be presented.
The continuous secondary endpoints will be analyzed in the same way as the primary endpoint,
but the results will be interpreted descriptively.
Kaplan-Meier estimates and log-rank test will be used to determine the occurrence of the
secondary endpoints over time. All categorical secondary endpoints will be compared between
treatment groups with frequency tables and Fisher's Exact Test including 95% confidence
intervals where possible. Adverse Events will be summarized per treatment group by body
system/system organ class, preferred terms, intensity, seriousness and relationship.
Sample size considerations: The primary endpoint is the change in General Health from
baseline to 12 months after baseline. Based on previous studies it is assumed that the
variable is normally distributed with a standard deviation for the change in General Health
of 20 units and an expected difference between groups of at least 10. 5 units. To detect a
difference of 10. 5 units in General Health (corresponding to an improvement of 15%, assuming
a mean General Health of 70 units in the conventional pharmacological therapy group) with a
power of 80% and a type I error of 5% (two-sided alternative), a sample size of
approximately 58 subjects in each treatment group is required, i. e. a total number of 116
patients. Another 20 patients are added to ensure calculated number of patients for analysis
at 12 months. The power to detect a difference of 10. 5 for 136 (116+20) and 140 (the minimum
expected total number) patients is 85% and 86%, respectively.
A 1: 1 block randomization will be used within each centre, stratifying patients between
paroxysmal and persistent AF.
Eligibility
Minimum age: 30 Years.
Maximum age: 70 Years.
Gender(s): Both.
Criteria:
Inclusion Criteria:
1. Patients with symptoms related to atrial fibrillation (AF), who have failed or been
intolerant to at least one drug used for either rate or rhythm control (Vaughan
Williams class I, II, or III anti-arrhythmic drug) thus excluding digitalis and
Calcium channel inhibitors.
2. The first diagnosis of AF must have been first noted more than 6 months prior to
consideration.
3. At least one AF episode documented on 12-lead ECG or 2-channel telemetry/ Holter
recording during the previous 12 months.
4. Paroxysmal AF (AF is self-terminating within 7 days of recognized onset) with
occurrence of at least one symptomatic episodes (patient history) in the previous 2
months that merits non-pharmacological intervention (see classification), or
5. Persistent AF (AF is not self-terminating within 7 days or is terminated electrically
or pharmacologically) with occurrence of at least 2 symptomatic episodes of AF in the
previous 12 months, necessitating pharmacological or electrical cardioversions (CV),
on or off antiarrhythmic drugs that merits non-pharmacological intervention. Upon
cardioversion, it must be documented that sinus rhythm can be maintained for at least
1 hour, to distinguish from permanent AF.
Exclusion Criteria:
1. Patients who have tested 2 or more anti-arrhythmic drugs for rhythm control at
highest tolerable dosages (Vaughan Williams class I or III anti-arrhythmic drug;
flecainide, propafenone, disopyramide, sotalol or amiodarone).
2. AF secondary to a transient or correctable abnormality including electrolyte
imbalance, trauma, recent surgery, infection, toxic ingestion, and uncontrolled
thyroid disease.
3. Atrial fibrillation episodes triggered by another uniform supraventricular
tachycardia.
4. Untreated or uncontrolled hypertension
5. Valvular disease requiring chronic anticoagulation or planned valve surgery within 2
years.
6. Contraindication to treatment with Warfarin or other anticoagulants.
7. Heart failure with New York Heart Association (NYHA ) class III or IV or left
ventricular ejection fraction (LVEF) < 35 %, which is not secondary to AF with
inadequate rate control, according to the judgement of the investigator.
8. Left atrial diameter > 60 mm.
9. Unstable angina or acute myocardial infarction within last 3 months.
10. Cardiac revascularization procedure within last 6 months.
11. Prior cardiac surgery or planned cardiac corrective surgery within 1 year.
12. Prior AF ablation procedure
13. Implantable cardioverter-defibrillator, biventricular pacing device, Dual chamber-
and single chamber - pacemaker if needed for ventricular pacing, as well as
Atrioventricular (AV) block II-III and sustained ventricular tachyarrhythmias.
14. Patients with intra-atrial thrombus, tumor, or another abnormality in whom
transseptal catheterization or appropriate vascular access is precluded.
15. Renal failure requiring dialysis or abnormalities of liver function tests
16. Participant in investigational clinical or device trial.
17. Pregnant women.
18. Unwilling or unable to give informed consent or inaccessible for follow-up. Specify
if implantable cardiac monitor (ICM) was not accepted by the patient to be implanted.
19. Psychological problem that might limit compliance.
20. Active abuse of alcohol or other substance which may be causative of AF and/or might
affect compliance.
Locations and Contacts
Carina Blomström Lundqvist, Uppsala S-75185, Sweden
Additional Information
Starting date: May 2008
Last updated: November 19, 2014
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