Multifaceted Intervention for Increasing Performance of CPR by Laypersons in Out-of-hospital Cardiac Arrest (DISPATCH)

Grenoble Alpes University Hospital Center (CHU) logo

Grenoble Alpes University Hospital Center (CHU)




Cardiac Arrest


Other: Multifaceted intervention including 3 components

Study type


Funder types




Details and patient eligibility


Cardiac arrest (CA) early recognition is essential in order to rapidly activate emergency services and for bystanders to begin cardiopulmonary resuscitation (CPR). As soon as a call is received, EMS dispatchers should try to identify CA. This may be difficult, in a context of stress and distress of the person calling. Yet, it is vital for bystanders to initiate CPR. Survival can be multiplied by 2 to 4 if the bystanders initiate a CPR before the arrival of the emergency medical services. This work aim to assess a multifaceted intervention combining 3 elements to improve the initial phone recognition of CA and raise the number of patients benefiting from CPR before EMS arrival on scene. The first element is a dispatcher training to the early phone recognition of CA. This training will be based on the concept of active teaching, favouring the interactive work of learners in particular by listening to real dispatch recordings. It will be completed by continuing education with a distance teaching platform including the systematic listening of recorded CA calls. The second element is based on the deployment of a software aiming to notify CA thanks to mobile phones. This system interfaced to a control software enables to request the participation of CPR-trained volunteers automatically. The volunteers have to be located in the patient's surroundings. The deployment of this mobile application will rely on first-aid volunteers, health personal and any trained volunteers willing to participate. A randomized control study in one city area proved the efficiency of a similar software to improve the proportion of CPR by bystanders. The third element consists in a motivational feedback. A weekly overview of the management and the outcomes of patients who suffered CA will be broadcast to all the responders and volunteers in the mobile application.


2,481 patients




18+ years old


No Healthy Volunteers

Inclusion criteria

  • All adults with nontraumatic, out-of-hospital cardiac arrest diagnosed during the emergency medical service call
  • Cardiac arrest located in urban area

Exclusion criteria

  • Pregnant or breastfeeding women
  • Patients under the law
  • Patients deprived of liberty by court ruling or administrative ruling
  • Traumatic cardiac arrest
  • CA occurring under the eyes of a professional emergency services patrol on duty
  • Cardiac arrest for which resuscitation seem unjustified (inevitable death, terminally ill irreversible condition, too long duration of cardiac arrest, non-resuscitation personal directive…)

Trial design

Primary purpose




Interventional model

Sequential Assignment


Single Blind

2,481 participants in 2 patient groups

Control Group
No Intervention group
Usual management of patients according to international guidelines. Protocols of call acceptance, phone advice and sending of emergency services are not modified
Test Group
Other group
Multifaceted intervention Training using distance learning for medical regulation assistants to recognise cardiac arrest on phone Activation of the location-software application to send bystanders on cardiac arrest location before the arrival of emergency medical services (EMS) Motivation feed-back Volunteers will received feed-back regarding CPR initiated before EMS arrival and survival
Other: Multifaceted intervention including 3 components

Trial contacts and locations



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