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It can happen anytime, anywhere: someone suddenly collapses as a result of cardiac arrest and lies unconscious on the ground. Why is resuscitation by first responders - usually laypeople - so vital when cardiac arrest is observed? What must a first responder do? What does a heart attack have to do with sudden cardiac death? What exactly happens in the heart during ventricular fibrillation that leads to cardiac arrest? The Heart Foundation's animated film makes this topic understandable for everyone.