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Heart MRI may reveal who really needs a shock device

NCT ID NCT04908306

Knowledge-focused 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 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 study looked at 502 people with heart failure who were getting an implantable defibrillator (ICD) to prevent sudden cardiac arrest. Researchers used a special MRI to see if heart scarring patterns could predict who would later need a shock from the device. The goal was to learn more about which patients truly benefit from these devices.

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.

Participants

502 people

The number who actually took part.

Started

Oct 2011

Finished

Jul 2024

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.

Who is studied

Patients referred for or being considered for primary prevention ICD, with or without CRT, will be recruited from the Electrophysiology services at each enrolling site

Ages

Children (under 18), adults (18 to 64) and older adults (65 and over)

Sex

Anyone

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: * .Any patient accepted for primary prevention ICD (+/-) CRT) Exclusion Criteria: * Known contra-indications to MRI. * Recent myocardial infarction or revascularization procedure within the past 3 months. * GFR (glomerular filtration rate) ≤ 30 ml. / min/ m2.

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Conditions

The condition(s) this trial relates to.

heart failure

As listed by the trial registrant

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

Heart failure

More trials for these conditions

Other studies related to the condition(s) this trial covers.