Paroxysmal Atrial FibrillationCIRCA-DOSENCT01913522
Cryoballoon vs. Irrigated Radiofrequency Catheter Ablation: Double Short vs. Standard Exposure Duration
A study testing Pulmonary Vein Isolation in people with Paroxysmal Atrial Fibrillation, run by University of British Columbia at 1 site in Canada.
Trial summary
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia and is associated with reductions in quality of life, functional status, cardiac performance, and overall survival.1 Catheter ablation, which is centered on electrical isolation of triggering foci within the pulmonary veins (PVI) through… Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Paroxysmal Atrial Fibrillation
- What is being tested?
- Pulmonary Vein Isolation
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 348 participants
- Where
- 1 siteCanada
- Study dates
- Sep 2014to Mar 2019
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Non-permanent atrial fibrillation documented on a 12 lead ECG, TTM or Holter monitor within the last 12 months Low Burden Paroxysmal - ≥2 episodes of AF over the past 12 months; Episodes terminate spontaneously within 7 days or via cardioversion within 48 hours of onset.
- High Burden Paroxysmal - ≥4 episodes of AF over the past 6 months, with ≥2 episodes >6 hours in duration; Episodes terminate spontaneously within 7 days or via cardioversion within 48 hours of onset.
- Early Persistent - ≥2 episodes of AF over the past 12 months; Episodes are successfully terminated via cardioversion within 7 days of onset.
- Age of 18 years or older on the date of consent
- Candidate for ablation based on AF that is symptomatic and refractory (ineffective or intolerant) to at least one class 1 or 3 antiarrhythmic
- Continuous anticoagulation with warfarin (INR 2-3), low molecular weight heparin, or a novel oral antithrombotic (dabigatran, apixaban, rivaroxaban) for ≥4 weeks prior to the ablation; or a TEE that excludes LA thrombus ≤48 hours before ablation
- Informed Consent Form
Who cannot join
- Previous left atrial (LA) ablation or LA surgery
- Pre-existing pulmonary vein stenosis or PV stent
- Pre-existing hemidiaphragmatic paralysis
- Contraindication to anticoagulation or radiocontrast materials
- Anteroposterior LA diameter greater than 5.5 cm by TTE
- Cardiac valve prosthesis
Show all 20Show fewer
- Clinically significant (moderately-severe, or severe) mitral valve regurgitation or stenosis
- Myocardial infarction, PCI / PTCA, or coronary artery stenting during the 3-month period preceding the consent date
- Cardiac surgery during the three-month interval preceding the consent date
- Significant congenital heart defect (including atrial septal defects or PV abnormalities but not including PFO)
- NYHA class III or IV congestive heart failure
- Left ventricular ejection fraction (LVEF) less than 35%
- Hypertrophic cardiomyopathy
- Significant CKD (eGFR <30 mL/min/m2)
- Uncontrolled hyperthyroidism
- Cerebral ischemic event (strokes or TIAs) during the six-month interval preceding the consent date
- Subject known to be pregnant
- Life expectancy less than one (1) year
- Currently participating or anticipated to participate in any other clinical trial of a drug, device or biologic during the duration of this study
- Unwilling or unable to comply fully with study procedures and follow-up
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Cryoballoon vs. Irrigated Radiofrequency Catheter Ablation: The Effect of Double Short vs. Standard Exposure Cryoablation Duration During Pulmonary Vein Isolation.
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia and is associated with reductions in quality of life, functional status, cardiac performance, and overall survival.1 Catheter ablation, which is centered on electrical isolation of triggering foci within the pulmonary veins (PVI) through circumferential lesions around PV ostia, has been shown to result in sustained improvements in quality of life, decreased hospitalizations and, potentially, improved survival.2-4 PVI can be accomplished by percutaneous catheter-based thermo-coagulation (burning) with radiofrequency (RF) energy delivery or alternatively by thermo-cooling (freezing) with a cryoballoon catheter.5 Cryothermal ablation with a cryoballoon catheter offers an efficacious means to achieve PVI that is safer than the established technique. Although cryoballoon ablation has been used in clinical practice for sometime, the optimal duration of cryoballoon ablation has not been determined. Moreover, the biophysics of cryo-lesion formation suggests that repeated short freezes ("freeze-thaw-freeze" cycles) may be more efficacious in achieving deep homogenous lesion when compared to prolonged freezing durations. This grant proposal is to verify if repeated short freezing cycles are more efficacious (i.e., fewer recurrence of AF), and safer, than the established standard of long, single freeze cycles.
- Conditions
- Paroxysmal Atrial Fibrillation
- Being tested
- Pulmonary Vein Isolation
- Medical subject headings
- Atrial Fibrillation
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Pulmonary Vein IsolationProcedure or surgery
| Study group | Role | What they receive |
|---|---|---|
| Standard cryoablation | Experimental | Patients randomized to the standard group will undergo cryoablation with target duration of 240 seconds. Once PVI is achieved a single "bonus" application of 240 seconds will be delivered after the rewarming phase (to +20oC). Receives: Procedure: Pulmonary Vein Isolation |
| Irrigated RF Ablation | Active comparator | Patients randomized to irrigated RF group will undergo standard wide circumferential PVI with an irrigated radiofrequency catheter Receives: Procedure: Pulmonary Vein Isolation |
| Short Cryoablation | Experimental | Patients randomized to the multiple-freeze group will undergo cryoablation with target duration of 120 seconds. Once PVI is achieved a single "bonus" application of 120 seconds will be delivered after the rewarming phase (to +20oC). Receives: Procedure: Pulmonary Vein Isolation |
What is being measured
The primary outcome is the main question the study is designed to answer.
Time to first recurrence of AF, atrial flutter, or left atrial tachycardia documented by 12-lead ECG, surface ECG rhythm strips, ambulatory ECG monitor, or implantable loop recorder and lasting 30 seconds or longer
Measured: 1 year
Secondary outcomes (3)
Time to first recurrence of symptomatic electrocardiographically documented AF/AFL/AT between days 91 and 365 after ablation
Measured: 1 year
Total arrhythmia burden (daily AF burden - hours/day; overall AF burden - % time in AF)
Measured: 1 year
Repeat ablation procedure because of documented recurrence of symptomatic AF/AFL/AT
Measured: 1 year
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted1 Aug 2013 (estimated)
- Study startSep 2014
- Primary completionDec 2018
- Study completionMar 2019
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (12)Papers the sponsor has linked to this study.
- Other trials for Paroxysmal Atrial FibrillationStudies of the same condition, open and under way.
- More trials run by University of British ColumbiaThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind
- Who is masked
- Participant, Investigator, Outcomes assessor
- Enrolment
- 348 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of British Columbia
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Jason Andrade, University of British Columbia
- Investigators
- Jason Andrade, MD, Principal investigator, University of British Columbia
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01913522
- Sponsor's protocol ID
- H13-01689
- Acronym
- CIRCA-DOSE
- Status last verified
- May 2019
- First submitted
- 30 Jul 2013
- Last updated
- 7 May 2019
- Results posted
- No
- Data monitoring committee
- No
Publications
Aguilar M, Macle L, Honfo SH, Khairy P, Cadrin-Tourigny J, Sidhu A, Deyell MW, Hawkins NM, Bennett RG, Andrade JG. Blanking Period After Catheter Ablation of Paroxysmal Atrial Fibrillation: Insights From Continuous Cardiac Monitoring. Circ Arrhythm Electrophysiol. 2025 Mar;18(3):e013232. doi: 10.1161/CIRCEP.124.013232. Epub 2025 Feb 18. No abstract available.
PubMed 39963799Andrade JG, Bennett RG, Deyell MW, Bennett MT, Phulka J, Hawkins NM, Aksu T, Field TS, Aguilar M, Khairy P, Macle L. Long-Term Differences in Autonomic Alterations After Cryoballoon vs Radiofrequency Atrial Fibrillation Ablation. JACC Clin Electrophysiol. 2025 Jan;11(1):19-29. doi: 10.1016/j.jacep.2024.09.003. Epub 2024 Oct 30.
PubMed 39480391Aguilar M, Macle L, Deyell MW, Yao R, Hawkins NM, Khairy P, Andrade JG. Influence of Monitoring Strategy on Assessment of Ablation Success and Postablation Atrial Fibrillation Burden Assessment: Implications for Practice and Clinical Trial Design. Circulation. 2022 Jan 4;145(1):21-30. doi: 10.1161/CIRCULATIONAHA.121.056109. Epub 2021 Nov 24.
PubMed 34816727Samuel M, Khairy P, Champagne J, Deyell MW, Macle L, Leong-Sit P, Novak P, Badra-Verdu M, Sapp J, Tardif JC, Andrade JG. Association of Atrial Fibrillation Burden With Health-Related Quality of Life After Atrial Fibrillation Ablation: Substudy of the Cryoballoon vs Contact-Force Atrial Fibrillation Ablation (CIRCA-DOSE) Randomized Clinical Trial. JAMA Cardiol. 2021 Nov 1;6(11):1324-1328. doi: 10.1001/jamacardio.2021.3063.
PubMed 34406350Tang LYW, Hawkins NM, Ho K, Tam R, Deyell MW, Macle L, Verma A, Khairy P, Sheldon R, Andrade JG; CIRCA-DOSE Study Investigators. Autonomic Alterations After Pulmonary Vein Isolation in the CIRCA-DOSE (Cryoballoon vs Irrigated Radiofrequency Catheter Ablation) Study. J Am Heart Assoc. 2021 Feb;10(5):e018610. doi: 10.1161/JAHA.120.018610. Epub 2021 Feb 26.
PubMed 33634706Yao RJR, Macle L, Deyell MW, Tang L, Hawkins NM, Sedlak T, Nault I, Verma A, Khairy P, Andrade JG; CIRCA-DOSE Study Investigators. Impact of Female Sex on Clinical Presentation and Ablation Outcomes in the CIRCA-DOSE Study. JACC Clin Electrophysiol. 2020 Aug;6(8):945-954. doi: 10.1016/j.jacep.2020.04.032. Epub 2020 Jul 29.
PubMed 32819529Andrade JG, Macle L, Verma A, Deyell MW, Champagne J, Dubuc M, Leong-Sit P, Novak P, Roux JF, Sapp J, Khoo C, Rizkallah J, Levesque S, Tang ASL, Khairy P; CIRCA-DOSE Study Investigators. Quality of Life and Health Care Utilization in the CIRCA-DOSE Study. JACC Clin Electrophysiol. 2020 Aug;6(8):935-944. doi: 10.1016/j.jacep.2020.04.017.
PubMed 32819528Andrade JG, Deyell MW, Verma A, Macle L, Champagne J, Leong-Sit P, Novak P, Badra-Verdu M, Sapp J, Khairy P, Nattel S. Association of Atrial Fibrillation Episode Duration With Arrhythmia Recurrence Following Ablation: A Secondary Analysis of a Randomized Clinical Trial. JAMA Netw Open. 2020 Jul 1;3(7):e208748. doi: 10.1001/jamanetworkopen.2020.8748.
PubMed 32614422Andrade JG, Yao RRJ, Deyell MW, Hawkins NM, Rizkallah J, Jolly U, Khoo C, Raymond JM, McKinney J, Cheung C, Steinberg C, Ha A, Ramanathan K, Luong C, Glover B, Verma A, Macle L, Khairy P; CIRCA-DOSE Study Investigators. Clinical assessment of AF pattern is poorly correlated with AF burden and post ablation outcomes: A CIRCA-DOSE sub-study. J Electrocardiol. 2020 May-Jun;60:159-164. doi: 10.1016/j.jelectrocard.2020.03.008. Epub 2020 Mar 21.
PubMed 32371199Andrade JG, Deyell MW, Nattel S, Khairy P, Dubuc M, Champagne J, Leong-Sit P, Jolly U, Badra-Verdu M, Sapp J, Verma A, Macle L; CIRCA-DOSE Study Investigators. Prevalence and clinical impact of spontaneous and adenosine-induced pulmonary vein reconduction in the Contact-Force vs. Cryoballoon Atrial Fibrillation Ablation (CIRCA-DOSE) study. Heart Rhythm. 2020 Jun;17(6):897-904. doi: 10.1016/j.hrthm.2020.01.017. Epub 2020 Jan 21.
PubMed 31978593Andrade JG, Champagne J, Dubuc M, Deyell MW, Verma A, Macle L, Leong-Sit P, Novak P, Badra-Verdu M, Sapp J, Mangat I, Khoo C, Steinberg C, Bennett MT, Tang ASL, Khairy P; CIRCA-DOSE Study Investigators. Cryoballoon or Radiofrequency Ablation for Atrial Fibrillation Assessed by Continuous Monitoring: A Randomized Clinical Trial. Circulation. 2019 Nov 26;140(22):1779-1788. doi: 10.1161/CIRCULATIONAHA.119.042622. Epub 2019 Oct 21.
PubMed 31630538Andrade JG, Deyell MW, Badra M, Champagne J, Dubuc M, Leong-Sit P, Macle L, Novak P, Roux JF, Sapp J, Tang A, Verma A, Wells GA, Khairy P. Randomised clinical trial of cryoballoon versus irrigated radio frequency catheter ablation for atrial fibrillation-the effect of double short versus standard exposure cryoablation duration during pulmonary vein isolation (CIRCA-DOSE): methods and rationale. BMJ Open. 2017 Oct 5;7(10):e017970. doi: 10.1136/bmjopen-2017-017970.
PubMed 28982836
Study at a glance
From the registry record, last updated by the sponsor on 7 May 2019. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Cryoballoon vs. Irrigated Radiofrequency Catheter Ablation: The Effect of Double Short vs. Standard Exposure Cryoablation Duration During Pulmonary Vein Isolation.
- ClinicalTrials.gov ID
- NCT01913522
- Acronym / sponsor ID
- CIRCA-DOSE / H13-01689
- Conditions
- Paroxysmal Atrial Fibrillation
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 348 participants (actual)
- Lead sponsor
- University of British ColumbiaUniversity, hospital or other
- Study start
- Sep 2014 (actual)
- Primary completion
- Dec 2018 (actual)
- Study completion
- Mar 2019 (actual)
- First posted
- 1 Aug 2013 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Atrial fibrillation (AF) is the most common sustained cardiac arrhythmia and is associated with reductions in quality of life, functional status, cardiac performance, and overall survival.1 Catheter ablation, which is centered on electrical isolation of triggering foci within the pulmonary veins (PVI) through circumferential lesions around PV ostia, has been shown to result in sustained improvements in quality of life, decreased hospitalizations and, potentially, improved survival.2-4 PVI can be accomplished by percutaneous catheter-based thermo-coagulation (burning) with radiofrequency (RF) energy delivery or alternatively by thermo-cooling (freezing) with a cryoballoon catheter.5 Cryothermal ablation with a cryoballoon catheter offers an efficacious means to achieve PVI that is safer than the established technique. Although cryoballoon ablation has been used in clinical practice for sometime, the optimal duration of cryoballoon ablation has not been determined. Moreover, the biophysics of cryo-lesion formation suggests that repeated short freezes ("freeze-thaw-freeze" cycles) may be more efficacious in achieving deep homogenous lesion when compared to prolonged freezing durations. This grant proposal is to verify if repeated short freezing cycles are more efficacious (i.e., fewer recurrence of AF), and safer, than the established standard of long, single freeze cycles.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind (participant, investigator, outcomes assessor)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Standard cryoablation | Experimental | Procedure: Pulmonary Vein IsolationPatients randomized to the standard group will undergo cryoablation with target duration of 240 seconds. Once PVI is achieved a single "bonus" application of 240 seconds will be delivered after the rewarming phase (to +20oC). |
| Irrigated RF Ablation | Active comparator | Procedure: Pulmonary Vein IsolationPatients randomized to irrigated RF group will undergo standard wide circumferential PVI with an irrigated radiofrequency catheter |
| Short Cryoablation | Experimental | Procedure: Pulmonary Vein IsolationPatients randomized to the multiple-freeze group will undergo cryoablation with target duration of 120 seconds. Once PVI is achieved a single "bonus" application of 120 seconds will be delivered after the rewarming phase (to +20oC). |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (7 listed)
- Non-permanent atrial fibrillation documented on a 12 lead ECG, TTM or Holter monitor within the last 12 months Low Burden Paroxysmal - ≥2 episodes of AF over the past 12 months; Episodes terminate spontaneously within 7 days or via cardioversion within 48 hours of onset.
- High Burden Paroxysmal - ≥4 episodes of AF over the past 6 months, with ≥2 episodes >6 hours in duration; Episodes terminate spontaneously within 7 days or via cardioversion within 48 hours of onset.
- Early Persistent - ≥2 episodes of AF over the past 12 months; Episodes are successfully terminated via cardioversion within 7 days of onset.
- Age of 18 years or older on the date of consent
- Candidate for ablation based on AF that is symptomatic and refractory (ineffective or intolerant) to at least one class 1 or 3 antiarrhythmic
Key exclusion criteria (20 listed)
- Previous left atrial (LA) ablation or LA surgery
- Pre-existing pulmonary vein stenosis or PV stent
- Pre-existing hemidiaphragmatic paralysis
- Contraindication to anticoagulation or radiocontrast materials
- Anteroposterior LA diameter greater than 5.5 cm by TTE
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Pulmonary Vein Isolation | Procedure or surgery | Irrigated RF Ablation, Short Cryoablation, Standard cryoablation |
Primary outcome
Time to first recurrence of AF, atrial flutter, or left atrial tachycardia documented by 12-lead ECG, surface ECG rhythm strips, ambulatory ECG monitor, or implantable loop recorder and lasting 30 seconds or longer
Time frame: 1 year
3 secondary outcomes
Time to first recurrence of symptomatic electrocardiographically documented AF/AFL/AT between days 91 and 365 after ablation
Time frame: 1 year
Total arrhythmia burden (daily AF burden - hours/day; overall AF burden - % time in AF)
Time frame: 1 year
Repeat ablation procedure because of documented recurrence of symptomatic AF/AFL/AT
Time frame: 1 year
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 7 May 2019.
- Derived from this study: PubMed 39963799Aguilar M, Macle L, Honfo SH, Khairy P, Cadrin-Tourigny J, Sidhu A, Deyell MW, Hawkins NM, Bennett RG, Andrade JG. Blanking Period After Catheter Ablation of Paroxysmal Atrial Fibrillation: Insights From Continuous Cardiac Monitoring. Circ Arrhythm Electrophysiol. 2025 Mar;18(3):e013232. doi: 10.1161/CIRCEP.124.013232. Epub 2025 Feb 18. No abstract available.
- Derived from this study: PubMed 39480391Andrade JG, Bennett RG, Deyell MW, Bennett MT, Phulka J, Hawkins NM, Aksu T, Field TS, Aguilar M, Khairy P, Macle L. Long-Term Differences in Autonomic Alterations After Cryoballoon vs Radiofrequency Atrial Fibrillation Ablation. JACC Clin Electrophysiol. 2025 Jan;11(1):19-29. doi: 10.1016/j.jacep.2024.09.003. Epub 2024 Oct 30.
- Derived from this study: PubMed 34816727Aguilar M, Macle L, Deyell MW, Yao R, Hawkins NM, Khairy P, Andrade JG. Influence of Monitoring Strategy on Assessment of Ablation Success and Postablation Atrial Fibrillation Burden Assessment: Implications for Practice and Clinical Trial Design. Circulation. 2022 Jan 4;145(1):21-30. doi: 10.1161/CIRCULATIONAHA.121.056109. Epub 2021 Nov 24.
- Derived from this study: PubMed 34406350Samuel M, Khairy P, Champagne J, Deyell MW, Macle L, Leong-Sit P, Novak P, Badra-Verdu M, Sapp J, Tardif JC, Andrade JG. Association of Atrial Fibrillation Burden With Health-Related Quality of Life After Atrial Fibrillation Ablation: Substudy of the Cryoballoon vs Contact-Force Atrial Fibrillation Ablation (CIRCA-DOSE) Randomized Clinical Trial. JAMA Cardiol. 2021 Nov 1;6(11):1324-1328. doi: 10.1001/jamacardio.2021.3063.
- Derived from this study: PubMed 33634706Tang LYW, Hawkins NM, Ho K, Tam R, Deyell MW, Macle L, Verma A, Khairy P, Sheldon R, Andrade JG; CIRCA-DOSE Study Investigators. Autonomic Alterations After Pulmonary Vein Isolation in the CIRCA-DOSE (Cryoballoon vs Irrigated Radiofrequency Catheter Ablation) Study. J Am Heart Assoc. 2021 Feb;10(5):e018610. doi: 10.1161/JAHA.120.018610. Epub 2021 Feb 26.
- Derived from this study: PubMed 32819529Yao RJR, Macle L, Deyell MW, Tang L, Hawkins NM, Sedlak T, Nault I, Verma A, Khairy P, Andrade JG; CIRCA-DOSE Study Investigators. Impact of Female Sex on Clinical Presentation and Ablation Outcomes in the CIRCA-DOSE Study. JACC Clin Electrophysiol. 2020 Aug;6(8):945-954. doi: 10.1016/j.jacep.2020.04.032. Epub 2020 Jul 29.
- Derived from this study: PubMed 32819528Andrade JG, Macle L, Verma A, Deyell MW, Champagne J, Dubuc M, Leong-Sit P, Novak P, Roux JF, Sapp J, Khoo C, Rizkallah J, Levesque S, Tang ASL, Khairy P; CIRCA-DOSE Study Investigators. Quality of Life and Health Care Utilization in the CIRCA-DOSE Study. JACC Clin Electrophysiol. 2020 Aug;6(8):935-944. doi: 10.1016/j.jacep.2020.04.017.
- Derived from this study: PubMed 32614422Andrade JG, Deyell MW, Verma A, Macle L, Champagne J, Leong-Sit P, Novak P, Badra-Verdu M, Sapp J, Khairy P, Nattel S. Association of Atrial Fibrillation Episode Duration With Arrhythmia Recurrence Following Ablation: A Secondary Analysis of a Randomized Clinical Trial. JAMA Netw Open. 2020 Jul 1;3(7):e208748. doi: 10.1001/jamanetworkopen.2020.8748.
- Derived from this study: PubMed 32371199Andrade JG, Yao RRJ, Deyell MW, Hawkins NM, Rizkallah J, Jolly U, Khoo C, Raymond JM, McKinney J, Cheung C, Steinberg C, Ha A, Ramanathan K, Luong C, Glover B, Verma A, Macle L, Khairy P; CIRCA-DOSE Study Investigators. Clinical assessment of AF pattern is poorly correlated with AF burden and post ablation outcomes: A CIRCA-DOSE sub-study. J Electrocardiol. 2020 May-Jun;60:159-164. doi: 10.1016/j.jelectrocard.2020.03.008. Epub 2020 Mar 21.
- Derived from this study: PubMed 31978593Andrade JG, Deyell MW, Nattel S, Khairy P, Dubuc M, Champagne J, Leong-Sit P, Jolly U, Badra-Verdu M, Sapp J, Verma A, Macle L; CIRCA-DOSE Study Investigators. Prevalence and clinical impact of spontaneous and adenosine-induced pulmonary vein reconduction in the Contact-Force vs. Cryoballoon Atrial Fibrillation Ablation (CIRCA-DOSE) study. Heart Rhythm. 2020 Jun;17(6):897-904. doi: 10.1016/j.hrthm.2020.01.017. Epub 2020 Jan 21.
- Derived from this study: PubMed 31630538Andrade JG, Champagne J, Dubuc M, Deyell MW, Verma A, Macle L, Leong-Sit P, Novak P, Badra-Verdu M, Sapp J, Mangat I, Khoo C, Steinberg C, Bennett MT, Tang ASL, Khairy P; CIRCA-DOSE Study Investigators. Cryoballoon or Radiofrequency Ablation for Atrial Fibrillation Assessed by Continuous Monitoring: A Randomized Clinical Trial. Circulation. 2019 Nov 26;140(22):1779-1788. doi: 10.1161/CIRCULATIONAHA.119.042622. Epub 2019 Oct 21.
- Derived from this study: PubMed 28982836Andrade JG, Deyell MW, Badra M, Champagne J, Dubuc M, Leong-Sit P, Macle L, Novak P, Roux JF, Sapp J, Tang A, Verma A, Wells GA, Khairy P. Randomised clinical trial of cryoballoon versus irrigated radio frequency catheter ablation for atrial fibrillation-the effect of double short versus standard exposure cryoablation duration during pulmonary vein isolation (CIRCA-DOSE): methods and rationale. BMJ Open. 2017 Oct 5;7(10):e017970. doi: 10.1136/bmjopen-2017-017970.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Jason Andrade, MD principal investigator
University of British Columbia
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Pulmonary Vein Isolation in people with Paroxysmal Atrial Fibrillation, run by University of British Columbia at 1 site in Canada.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 7 inclusion and 20 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 7 May 2019. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Canada. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Time to first recurrence of AF, atrial flutter, or left atrial tachycardia documented by 12-lead ECG, surface ECG rhythm strips, ambulatory ECG monitor, or implantable loop recorder and lasting 30 seconds or longer (time frame: 1 year). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT01913522, which also lists 12 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 7 May 2019.