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High-Energy showdown: 360J vs 200J shocks for AFib

NCT ID NCT06556667

Symptom relief Sponsor: Ottawa Heart Institute Research Corporation Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This trial compares two defibrillators—one delivering a maximum of 200 joules and the other 360 joules—to see which is better at restoring normal heart rhythm in people with persistent atrial fibrillation. About 376 adults scheduled for elective cardioversion will be randomly assigned to receive a shock from one of the two devices. The main goal is to see which device achieves a successful conversion to sinus rhythm more often.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
biphasic defibrillator shock (200J or 360J)
What this could lead to
If successful, this could show that a higher-energy shock is more effective at restoring normal heart rhythm during cardioversion for atrial fibrillation.
What could go wrong
This is a small, early-stage trial focused on a single procedure. Results may not apply to all patients or defibrillator brands, and higher energy may cause more discomfort or rare complications.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 376 people

The number the study aims to enrol. It can still change while the study runs.

Started

Mar 2025

Expected to finish

Sep 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Patients age \> 18 years. * Persistent atrial fibrillation. * Scheduled for elective cardioversion at UOHI * Patient is within the circle of care of UOHI Electrophysiology staff Exclusion Criteria: * Known left-atrial appendage thrombus. * Contraindication to appropriate anticoagulation. * Patient is included in another randomized clinical trial. * Patient does not meet all of the above listed inclusion criteria.

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Conditions

The condition(s) this trial relates to.

atrial fibrillation

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Atrial fibrillation Cardioversion

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • University of Ottawa Heart Institute

    RECRUITING

    Ottawa, Ontario, K1Y 4W7, Canada

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