Inclusion criteria:
All patients who suffer an out of hospital cardiac arrest *) and are attendes by the EMS at any stage during the event.
This study will include all events that occur between 00:00 on 1^st October 2014 and 23:59 on 31^st October 2014.
*) A cardiac arrest that occurs in any location other than an acute hospital .

You find the study protocoll and the data variable list here: 

Patients will be included irrespective of their age, gender or personal factors.


These inclusion criteria include all patients who receive resuscitation (chest compression and / or defibrillation of any type)
·      by the EMS,
·      by bystanders before the arrival of the EMS with continued resuscitation by the EMS
·      by bystanders before the arrival of the EMS, that is immediately stopped (for any reason) when the EMS arrives
·      by bystanders with ROSC before the arrival of the EMS
 
It also includes patients found or declared dead (for any reason).
 
Some countries or registries may not be able to provide all necessary data to answer every research question. These registries will not be included in the analysis of the related research questions.
 
Participating registries/centres:
All Registries throughout Europe, able to provide at least the core data demanded, are invited to participate in this study. Requirements are a written letter of intent to participate in this study, a written consent to follow this study protocol and a valid ethical approval (see below) if needed. Should there be more than one registry serving the same region and population, the national coordinator is responsible for avoiding multiple submissions of patients’ data. The national coordinator will be required to submit all the data for the whole country to the study management team.

Written approval of participation:
All participating registries must guarantee the existence of written approvals from the EMS organisations they serve to use and submit data for the EuReCa ONE study. These approvals may follow local policy and do not need to have a specific format but must include terms clearly describing the permission to use and transmit defined data for research purposes on an international basis. The national coordinator is responsible for obtaining this approval.

Ethical approval:
Ethical approval will be applied for by national coordinators (see above) if necessary. Ethical approval may not be required in every nation of the participating registries. Participants are not allowed to report data unless ethical approval or a documented waiver (stating there is no requirement for ethical approval) exists for their country. The ethical approval or the documented waiver must be sent to the study management team. As only anonymised data will be reported and the data is recorded as part of routine care, a requirement for patient consent is not expected. It is however the role of the national coordinator to ensure that patient consent is not required in his/her jurisdiction.

There are no interventions in this study other than the effort required by EMS personnel or systems to report the required information to the study. There is no reported or estimated risk related to participation in this study, and since the treatment is not changed, there is no increased risk involved for the patient. The benefit to the patient is that countries get to benchmark their results and compare with best practice. The national coordinator will decide if the protocol needs to be submitted to the national research ethical committee.