Cardiac arrest occurs suddenly and is closely linked with sudden chest pain.
In fact cardiac arrest is still the major single killer of people in Australia, and the casualty in cardiac arrest has only minutes from collapse until death is inevitable. Successful resuscitation of such a casualty depends on quick decisive action taken in sequence like the links in a chain. While each link or individual action in the chain is unlikely on its own to revive a casualty, all of them used effectively together will provide the best chance for a successful outcome. Without your quick action the casualty has little chance of survival no matter how good the paramedics or doctors are. Get to the cardiac arrest casualty quickly and call for an ambulance or other medical assistance.