• Alison Booth, Alexander Moylan, Jasmin Hodgson, Kath Wright, Kristyn Langworthy, Naoki Shimizu, and Ian Maconochie.
• Department of Health Sciences, University of York, York, YO10 5DD, UK. Electronic address: alison.booth@york.ac.uk.
• Resuscitation. 2018 Aug 1; 129: 70-75.

BackgroundCardiac arrest, particularly in children, often has a poor outcome and international guidelines highlight significant gaps in the evidence base for effective resuscitation. Whilst randomised controlled trials for some interventions can be justified, they are not appropriate for many aspects of resuscitation. Therefore, guidelines must use other sources of data such as epidemiological evidence from cardiac arrest registries, to improve the efficacy of resuscitation. The aim of our study was to identify existing national cardiac arrest registries and document key information about the registries, including whether they contain data on paediatric arrests.MethodsKey bibliographic databases were searched for papers about or using data from cardiac arrest registries. Two reviewers independently screened the search results for relevant papers. A list of registers named in the papers was compiled and information obtained from the papers and the websites of registers where possible.ResultsTwenty three active national or large regional cardiac arrest registries were identified. These included five international collaborations and 10 registries that cover a population of at least 10 million people. Twelve registries are based in Europe, five in North America, four in Asia and two in Australasia. The registries vary in their organisation, but the majority (20) defer to the Utstein reporting guidelines for cardiac arrest. Registries covered populations between 0.4 and 174.5 million and contained between 100 and 605,505 records. Sixteen collected data on out-of-hospital arrests only; three in-hospital arrests only; and four included both. For ten registers the number of paediatric arrests was available and ranged from 56 to 3900.ConclusionsTo our knowledge this report contains the most complete list of active national and large regional cardiac arrest registries. Register data support current guidelines on effective resuscitation however, even the largest registries include relatively small numbers, particularly of paediatric events. A less fragmented approach has the potential to improve the utility of registration data for the benefit of patients.Copyright © 2018 Elsevier B.V. All rights reserved.

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