CPR should be performed on a patient who is unconscious and non-responsive if they are not breathing or are breathing abnormally (such as gasping). The recommended action is to start CPR as soon as possible after calling for emergency help. CPR involves chest compressions and rescue breaths to circulate blood and oxygen to vital organs until professional medical treatment is available. If the person is unresponsive but breathing normally, they should be placed in the recovery position instead of CPR. Key points for starting CPR:

• The patient is unconscious and not responding.
• The patient is either not breathing or breathing abnormally.
• Call emergency services immediately.
• Start chest compressions at a rate of about 100 to 120 compressions per minute.
• Give rescue breaths if trained, but chest compressions alone are still effective if breaths cannot be given.

This approach is in line with guidelines from major health organizations like the American Red Cross, Australian health guidelines, and European resuscitation councils.