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Maaret Castren passionately delivers her take on how to improve outcomes from out-of-hospital cardiac arrests. Maaret brings resuscitation back to the basics. Using science, education and local organisation factored together, we can drastically improve the chance of survival in out-of-hospital cardiac arrest. Currently, the best systems in the world only garner 20% survival rates in these situations. Mareet explains that quite simply, education is lacking. She believes the first step is to know your patient. 50% of cardiac arrest patients have signs and symptoms in the preceding weeks before their arrests. However, there is no current sudden cardiac arrest risk prediction tool available! Maaret explains the concept of precision medicine – the idea that medicine practised in a one size fits all manner provides successful treatments to some patients but not all. One must consider individual differences in people’s genes, environments and lifestyles. In resuscitation medicine this can simply mean altering hand p