Atrial FibrillationNCT04545619

Performance of QDOT Micro™ Catheter With nGEN Generator for Patients With AFIB.

A study testing QDOT MICRO System in people with Atrial Fibrillation, run by Biosense Webster, Inc. at 1 site in Canada.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record

Search all trials

Trial summary

This workflow study will further evaluate the acute performance and safety of the QDOT MICRO™ catheter in a clinical setting used in combination with nGEN Generator. Subjects will be followed for 7 days post procedure. Read more about this study

Who is it for?: Ages 18 years and older
Conditions the study is for: Atrial Fibrillation
What is being tested?: QDOT MICRO System
Type of treatment: Medical device
Could I receive a placebo?: No, everyone receives an active treatment
How many people: 40 participants
Where: 1 siteCanada
Study dates: 2 Oct 2020to 9 Nov 2021
Phase: Interventional
Are there results?: Yes, posted in the registrySummary in the doctors' view

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

Subjects diagnosed with symptomatic paroxysmal or early persistent AF undergoing a catheter ablation procedure through pulmonary vein isolation.
Age 18 or older.
Signed the Patient Informed Consent Form (ICF).

Who cannot join

If the patient has had a ventriculotomy or atriotomy within the preceding twelve weeks.
Presence of a myxoma or an intracardiac thrombus.
Presence of prosthetic valves.
Presence of active systemic infection
Patient with an interatrial baffle or patch
Women who are pregnant (as evidenced by pregnancy test if pre-menopausal), lactating, or who are of child bearing age and plan on becoming pregnant during the course of the clinical investigation.

Trial locations and contacts

1 site in 1 country.

Canada1 site

Institut de Cardiologie de Montréal (Montreal Heart Institute)
Montreal, Quebec, H1T 1C8

Other trials in Canada

About this study

Official title: Acute Performance Evaluation of the QDOT Micro™ Catheter Used With nGEN Generator in Treatment of Patients With Atrial Fibrillation.

Conditions: Atrial Fibrillation
Being tested: QDOT MICRO System
Medical subject headings: Atrial Fibrillation

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

QDOT MICRO SystemDevice
QDOT Micro Catheter with nGEN Generator

Study groups in NCT04545619
Study group	Role	What they receive
Paroxysmal and Early Persistent AFIB	Experimental	Not described Receives: Device: QDOT MICRO System

What is being measured

The primary outcome is the main question the study is designed to answer.

Number of Participants Who Achieved Acute Procedural Success
Number of participants who achieved acute procedural success were reported. Acute procedural success was defined as confirmation of entrance block in all targeted pulmonary veins (PVs) after administration of adenosine/isoproterenol using the nGEN / QDOT Micro Ablation System. The participants without any QMODE+ applications for PVI were considered as a failure.
Measured: Up to 104 days

Secondary outcomes (1)

Number of Participants With Adverse Events (AEs)
Number of participants with AEs were reported. An AE was any untoward medical occurrence whether or not related to the study device or ablation procedure.
Measured: Up to 104 days

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

2 Oct 20209 Nov 2021

First posted11 Sep 2020
Study start2 Oct 2020
Primary completion9 Nov 2021
Study completion9 Nov 2021

Resources

Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
Other trials for Atrial FibrillationStudies of the same condition, open and under way.
More trials run by Biosense Webster, Inc.The 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: Other
Allocation: Not applicable
Intervention model: Single group
Masking: None (open label)
Enrolment: 40 participants (actual)

IDs, dates and publications

ClinicalTrials.gov ID: NCT04545619
Sponsor's protocol ID: BWI_2019_09
Status last verified: Jun 2025
First submitted: 18 Aug 2020
Last updated: 29 Jun 2025
Results posted: Yes, on ClinicalTrials.gov
FDA-regulated drug: No
FDA-regulated device: Yes
Individual data sharing: Yes: Johnson \& Johnson Medical Device Companies have an agreement with the Yale Open Data Access (YODA) Project to serve as the independent review panel for evaluation of requests for clinical study reports and participant level data from investigators and physicians for scientific research that will advance medical knowledge and public health. Requests for access to the study data can be submitted through the YODA Project site at http://yoda.yale.edu.

Want to know more?

The sponsor has not listed a contact. The official record may have more details.

Talk to your doctor first and take this page with you. Only the study team can confirm whether you can join.

Questions to ask the study team

What is the study trying to find out?
What would I need to do, and how often would I visit?
Could I receive a placebo instead of the treatment?
What are the possible risks and benefits for me?
Will it cost me anything? Are travel or time paid for?
Can I keep seeing my own doctor during the study?
What happens when the study ends?

See locations

Active, not recruiting
CONVERGE Post-Approval Study (PAS)
Chronic Atrial Fibrillation
Recruiting
Early Closure of Left Atrial Appendage for Patients With Atrial Fibrillation and Ischemic Stroke Despite Anticoagulation Therapy
Ischemic Stroke, Atrial Fibrillation
Active, not recruitingObservational study
Concomitant Left Atrial Appendage Closure and Pulsed Field Ablation-Asia
Concomitant Procedures, Atrial Fibrillation
Active, not recruiting
Horizon 360 Protocol for the Treatment of Paroxysmal Atrial Fibrillation With the Sphere-360™ Catheter and Affera™ Mapping and Ablation System (Horizon 360)
Paroxysmal AF
RecruitingPhase 2
Safety in Adult Participants With Atrial Fibrillation Who Are Treated With Anticoagulation
Atrial Fibrillation (AF)

All Atrial Fibrillation trials

Study at a glance

From the registry record, last updated by the sponsor on 29 Jun 2025. Recruitment status is as the sponsor reported it: confirm with the study team.

Official title: Acute Performance Evaluation of the QDOT Micro™ Catheter Used With nGEN Generator in Treatment of Patients With Atrial Fibrillation.
ClinicalTrials.gov ID: NCT04545619
Acronym / sponsor ID: BWI_2019_09
Conditions: Atrial Fibrillation
Study type: Interventional
Recruitment status: Completed
Enrolment: 40 participants (actual)
Lead sponsor: Biosense Webster, Inc.Industry (pharma, biotech, devices)
Study start: 2 Oct 2020 (actual)
Primary completion: 9 Nov 2021 (actual)
Study completion: 9 Nov 2021 (actual)
First posted: 11 Sep 2020 (actual)
Results: Posted 2 Dec 2022

Clinical summary

The research question as the sponsor registered it. This describes what the study plans to test, not what it found.

Study design

Primary purpose: Other
Allocation: Not applicable
Intervention model: Single group
Masking: None (open label)
Number of arms: 1

Arm	Type	Receives
Paroxysmal and Early Persistent AFIB	Experimental	Device: QDOT MICRO System

Who may qualify

Ages: 18 years and older
Sex: All
Healthy volunteers: Not accepted
Age groups: Adult, Older adult

Key inclusion criteria (3 listed)

Subjects diagnosed with symptomatic paroxysmal or early persistent AF undergoing a catheter ablation procedure through pulmonary vein isolation.
Age 18 or older.
Signed the Patient Informed Consent Form (ICF).

Key exclusion criteria (6 listed)

If the patient has had a ventriculotomy or atriotomy within the preceding twelve weeks.
Presence of a myxoma or an intracardiac thrombus.
Presence of prosthetic valves.
Presence of active systemic infection
Patient with an interatrial baffle or patch

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
QDOT MICRO SystemQDOT Micro Catheter with nGEN Generator	Device	Paroxysmal and Early Persistent AFIB

Primary outcome

Number of Participants Who Achieved Acute Procedural Success
Time frame: Up to 104 days
Number of participants who achieved acute procedural success were reported. Acute procedural success was defined as confirmation of entrance block in all targeted pulmonary veins (PVs) after administration of adenosine/isoproterenol using the nGEN / QDOT Micro Ablation System. The participants without any QMODE+ applications for PVI were considered as a failure.

1 secondary outcome

Number of Participants With Adverse Events (AEs)
Time frame: Up to 104 days

Results and safety

Results posted to the registry on 2 Dec 2022, as reported by the sponsor. Figures are copied from the record, not re-analysed. Full results on ClinicalTrials.gov.

Participant flow

Group	Started	Completed
QDOT-nGEN Catheter	40	39

Primary outcome: Number of Participants Who Achieved Acute Procedural Success

Time frame: Up to 104 days. Count of participants. Unit: Participants

Measure	QDOT-nGEN Catheter n = 38
Value	37

Population analysed: The effectiveness analysis set included all enrolled participants who met all eligibility criteria and had the investigational device inserted and underwent an ablation procedure with the study catheter used in conjunction with QMODE+ and /or QMODE for pulmonary vein isolation (PVI) (RF energy was delivered).

1 secondary outcome is reported in the full results.

Adverse events

Time frame: Up to 104 days. Other adverse events reported at 0% frequency or more

Group	Serious adverse events	Other adverse events	Deaths
QDOT-nGEN Catheter	1 of 39 (2.6%)	8 of 39 (20.5%)	0 of 39

Loading the posted results from ClinicalTrials.gov…

Research links

Official record on ClinicalTrials.govLast updated by the sponsor 29 Jun 2025.
Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
Individual participant dataSharing planned: Yes. Johnson \& Johnson Medical Device Companies have an agreement with the Yale Open Data Access (YODA) Project to serve as the independent review panel for evaluation of requests for clinical study reports and participant level data from investigators and physicians for scientific research that will advance medical knowledge and public health. Requests for access to the study data can be submitted through the YODA Project site at http://yoda.yale.edu.

Related trials for Atrial Fibrillation

Active, not recruiting
CONVERGE Post-Approval Study (PAS)
Chronic Atrial Fibrillation
Recruiting
Early Closure of Left Atrial Appendage for Patients With Atrial Fibrillation and Ischemic Stroke Despite Anticoagulation Therapy
Ischemic Stroke, Atrial Fibrillation
Active, not recruitingObservational study
Concomitant Left Atrial Appendage Closure and Pulsed Field Ablation-Asia
Concomitant Procedures, Atrial Fibrillation
Active, not recruiting
Horizon 360 Protocol for the Treatment of Paroxysmal Atrial Fibrillation With the Sphere-360™ Catheter and Affera™ Mapping and Ablation System (Horizon 360)
Paroxysmal AF
RecruitingPhase 2
Safety in Adult Participants With Atrial Fibrillation Who Are Treated With Anticoagulation
Atrial Fibrillation (AF)

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.

The record lists no contact. Use the official record to reach the sponsor.

1 site in 1 country: see every site and its status.

Questions about this trial

What is this clinical trial studying?

A study testing QDOT MICRO System in people with Atrial Fibrillation, run by Biosense Webster, Inc. 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 3 inclusion and 6 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 29 Jun 2025. 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?

Yes. Results are posted in the registry (first posted 2 Dec 2022). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

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?

Number of Participants Who Achieved Acute Procedural Success (time frame: Up to 104 days). 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 NCT04545619.

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 29 Jun 2025; AzTrials last refreshed its copy on 7 Nov 2026.