Sudden cardiac arrest is the leading cause of death in the industrialised world. It exacts a significant mortality with approximately 70,000 to 90,000 sudden cardiac deaths each year in the United Kingdom, and survival rates are only 2%. The majority of these deaths are due to<unk><unk>  secondary to myocardial infarction, or "heart attack". During<unk><unk> , cardiac output drops to zero, and, unless remedied promptly, death usually ensues within minutes.
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