Den här översättningen är inte klar ännu. Den här sidan är just nu på engelska.

Gå till den engelska sidan

Cure My Disease

Don't miss your cure!

 Log in / Sign up

App alerts heroes: volunteers with defibrillators rush to cardiac arrests

NCT ID NCT03835403

Disease control Sponsor: Emergency Medical Services, Capital Region, Denmark 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tested whether using a smartphone app to alert nearby volunteers (called 'heart runners') to bring an automated external defibrillator (AED) to a suspected cardiac arrest can improve survival. Over 2,000 emergency calls were randomly assigned to either activate these volunteers or provide standard emergency medical services alone. The main goal was to see if more patients were alive 30 days later, and the study also checked for any harm to the volunteers.

What this could mean

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

Active substance
Smartphone app activation of volunteer citizen first-responders with AEDs
What this could lead to
If successful, this approach could significantly increase survival rates for out-of-hospital cardiac arrest by getting defibrillators to patients faster.
What could go wrong
The trial is completed but results may show no survival benefit, and there are risks of psychological or physical harm to volunteer responders.

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

2,114 people

The number who actually took part.

Started

May 2019

Finished

Mar 2026

Lead sponsor

A government agency

The lead sponsor is a government body.

Who can take part

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

Ages

8 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: * All out-of-hospital cardiac arrests recognized by Emergency Medical Dispatcher and where the HeartRunner system is activated. * Non-traumatic etiology, this excludes intoxication, drowning or suicide. * Age \> 7 years Exclusion Criteria: * Caller is not in direct contact with the patient * If Emergency Medical Dispatcher deems AED is not indicated, e.g., in nursing homes where trained personal is present. * OHCAs not treated by the EMS due to ethical reasons or obvious signs of death * OHCAs with no heart runners within 1800 meters * Not true cardiac arrest (suspected, but not verified) * EMS-witnessed OHCAs Emergency medical dispatchers are instructed not to activate heart runners in case any of the exclusion criteria above. However, since it can be challenging for emergency medical dispatchers to gather sufficient information about the patient within the first few minutes, heart runners will admittedly be activated even though they should not have been. Since randomization will occur for all cases in which a heart runner is activated, cases with any of the exclusion criteria will be secondarily excluded. These cases will be accounted for but not included in analyses of outcome. Our pilot study showed approximately 60% of suspected cardiac arrests were true cardiac arrests. Therefore, we expect 40% of cases for which heart runners were dispatched not to be true cardiac arrests.

Get updates

Get notified about this study

Sign up to get updates when this study changes or when new studies for Out-of-hospital cardiac arrest are added.

Vår säkerhetsrekommendation!

Genom att skicka in godkänner du våra Användarvillkor

Conditions

The condition(s) this trial relates to.

cardiac arrest Out-of-Hospital Cardiac Arrest sudden cardiac arrest

As listed by the trial registrant

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

Out-of-hospital cardiac arrest

Contacts and locations

Locations

  • Emergency Medical Services Copenhagen

    Copenhagen, Ballerup, Denmark

More trials for these conditions

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