How Do We Know Someone Is in Cardiac Arrest? A cardiac arrest usually happens without warning. If someone is in cardiac arrest, they collapse suddenly and:
Will be unconscious.
Will be unresponsive.
Won't be breathing or breathing normally - not breathing normally may mean they’re making gasping noises.
Without immediate treatment or medical attention, the person will die. If you see someone having a cardiac arrest, phone 999 immediately and start start cardiopulmonary resuscitation (CPR).
Please watch the video below to learn how to do CPR.
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