Rescue breaths should only be done if you are properly trained.
You should breathe into the person’s mouth for 1 second during rescue breaths.
CPR should only be performed if the person is breathing abnormally.
If you're alone, call 999 or 112, switch to speaker mode, and begin CPR.
What is the correct way to position your hands on a casualty's chest when performing CPR?
What should you do immediately after determining the casualty is not responding?