How To Identify Cardiac Arrest in Body

What happens when someone has a cardiac arrest, and when should you perform CPR? 

A cardiac arrest happens when the heart suddenly stops pumping blood around the body.  Someone who is having a cardiac arrest will suddenly lose consciousness and will stop breathing or stop breathing normally. 

Find out more about how to identify if someone is having a cardiac arrest and needs CPR.

Remember: do not put your own safety at risk. Be aware of your surroundings and make sure you are in a safe environment before helping another person.


Once you have identified that a person is having a cardiac arrest, call for help, call 999 and start CPR immediately. Learn how to perform CPR with our guide. 

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