Compares two defibrillator devices for restoring normal heart rhythm in atrial fibrillation
Compares two defibrillator devices in adults with atrial fibrillation undergoing electrical cardioversion.
Plain-language title generated from the registry record
Registry title: MAX - SHOCK Clinical Trial
Key facts
- Where
- Ottawa, CanadaSee the site
Where in Canada
- University of Ottawa Heart InstituteOttawa, CanadaTaking people
Questions to ask the study team
- How often do I need to come in, and for how long each time?
- Are travel costs paid?
- Can I keep my own doctor?
- What happens if I want to stop?
Trial details
- Who runs it
- Ottawa Heart Institute Research Corporation
- Trial code
- NCT06556667
- Record updated
- 3 February 2026
- Original description
Can Electrical Cardioversion (ECV) for AF be improved. It is the preferred method to restore sinus rhythm in patients with AF in whom a rhythm-control strategy is pursued.Read full original descriptionShow less
Comparison of Maximum Energy Shocks From Two Defibrillator Vendors MAX - SHOCK- A Randomized Controlled Clinical Trial
Can Electrical Cardioversion (ECV) for AF be improved. It is the preferred method to restore sinus rhythm in patients with AF in whom a rhythm-control strategy is pursued.
Hypothesis:
ECV success rates will be greater with a biphasic defibrillator with maximum energy of 360J (® Physio-Control) compared to a biphasic defibrillator with maximum energy of 200J (® Zoll)
Inclusion: 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: 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.