What is a 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 and 
  • 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 for help immediately and start CPR.