Abstract
Purpose of the study: In the UK, 30,000 people sustain an out-of-hospital cardiac arrest (OHCA) each year.1 Consistency in approach for case definition and case is of central importance when comparing outcomes from OHCA between ambulance services and nations. How an organisation defines and identifies an OHCA will impact greatly on the denominator in calculating survival statistics. Data from the Department of Health National Quality Indicators has demonstrated that where resuscitation is attempted there is significant variability between ambulance services in rates of successful initial resuscitation (13–27%) and survival to hospital discharge (2–12%) which indicates the lack of a consistent approach to definition and case ascertainment.
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