How to save someone's life after a cardiac arrest

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Defibrillators should be used every time someone has a cardiac arrest but actually only get used in 2-3% of cases. Whilst you perform CPR and alert the emergency services, someone else should always be running for the nearest defibrillator. Inside Health's Dr Mark Porter demonstrates just how simple it is to use one. Image: Defibrillator. Credit: British Heart Foundation.