Each year around 2000 children have a cardiac arrest in the United Kingdom (UK) and approximately one fifth are admitted to Pediatric Intensive Care Unit. Many of these children eventually die and among those who survive, some will be left with brain damage which could affect their quality of life. Currently, it is difficult for doctors to predict how much brain damage there is at an early stage after cardiac arrest and if this will improve in time.

NEURO-PACK aims to follow up children 3 months after their cardiac arrest to assess their quality of life and current functional status (has the child returned to usual routine as before cardiac arrest/mild disability, can the child not participate in certain activities as they were before the cardiac arrest/moderate disability, or if the child has near to no mobility/severe disability). Investigators will find this out by using a questionnaire and the research team will telephone patients and their families 3 months after the child's cardiac arrest. This telephone call should take no longer than 30 minutes. This will then be analysed and will help towards constructing a tool which will help doctors to predict which children who have had a cardiac arrest may survive with minimal brain damage.

Patients will be recruited from participating PICU's. There is currently lack of accurate data to enable clinicians to predict which of these children die or survive with brain injury. This affects clear communication with families as well as decisions to apply critical care interventions by clinicians. There is also an important knowledge gap with regards to outcome of children who are admitted to pediatric intensive care after a cardiac arrest and then survive to discharge.

Inclusion Criteria:

1. Patients aged 24 hours up to 16th birthday
2. Requiring > 1minute cardiopulmonary resuscitation
3. Admitted to PICU after Out of Hospital Cardiac Arrest or In Hospital Cardiac Arrest
4. Requiring mechanical ventilation at PICU admission
5. Surviving to 3 months follow up.

Exclusion criteria:

1. Cardiac arrest occurring within a PICU or NICU (Neonatal Intensive Care Unit)
2. Clinical team at participating sites feel inclusion is inappropriate
3. Parent/ guardian or family member unable to understand the telephone questionnaires for outcome assessments in English

The NEURO-PACK observational study enables the prospective collection of a cohort of children after out-of-hospital or in-hospital cardiac arrest. Data will be collected prospectively after eligible patients are screened and informed consent has been obtained. Participants and their families will be contacted by the Trials office,3 months after the patients cardiac arrest to complete a questionnaire over the telephone regarding functional status. Only contact information of the parents/guardians will be shared with the central Trials Office once informed consent has been obtained so that follow-up assessments can be completed. This information will be stored in locked cabinets, in a swipe card Trials Office based in Birmingham for five years, in line with Good Clinical Practice (GCP) guidance.

The information collected from patients and their families will be analyzed and used to help construct a clinical prediction tool which will help clinicians to predict which children who have had cardiac arrest may survive with minimal brain damage.

Inclusion Criteria:

1. Patients aged 24 hours up to 16th birthday
2. Requiring > 1minute cardiopulmonary resuscitation
3. Admitted to PICU after Out of Hospital Cardiac Arrest or In Hospital Cardiac Arrest
4. Requiring mechanical ventilation at PICU admission
5. Surviving to 3 months follow up.

Exclusion Criteria:

1. Cardiac arrest occurring within a PICU or NICU (Neonatal Intensive Care Unit)
2. Clinical team at participating sites feel inclusion is inappropriate
3. Parent/ guardian or family member unable to understand the telephone questionnaires for outcome assessments in English

Children aged more than 24 hours and up to their 16th birthday who are admitted to PICU after a cardiac arrest outside of the unit.

Patients aged less than 24 hours will not be included as these patients are frequently managed within the neonatal intensive care unit setting. Patients aged 16 years or greater are frequently managed in the UK within the adult intensive care setting. Only patient admitted to a PICU will be eligible.

there is no plan to share individual participant data, however, we will be using and sharing data collected as a whole to construct a prediction tool to help clinicians predict the level of brain damage after cardiac arrest occurs.