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

NCT ID NCT06556667

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

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.

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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

Contacts and locations

Locations

University of Ottawa Heart Institute
RECRUITING

Ottawa, Ontario, K1Y 4W7, Canada

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