More than 10,000 people suffer out-of-hospital cardiac arrest every year. Only one in ten survives. Kajsa Andersson, who lay lifeless on the dance floor of Snerikes nation after a sudden cardiac arrest, is one of them.
Johan Kronståhl is an instructor in cardiopulmonary resuscitation and first aid – something that can be life-changing if someone collapses.
"A lot of people are afraid of making a mistake and accidentally hurting the person. But it's not dangerous, we can't do more harm than if we don't
In the clip: "Hello. Hello, what's your name?" – the expert on how to do CPR.