When you find somebody who appears to be unconscious or suffering from a heart attack it is very important to phone for an ambulance and go through the ABC OF RESUSCITATION! Even if you don't know what to do, any attempt will give the person a better chance of recovery.
A: Airway - Position the airway and clear it of any obvious obstructions (for adults)
B: Breathing - Look for signs of the person breathing, this may be if there chest is rising up and down, put your ear to there nose and feel for any air coming out. If there are no signs of breathing you will need to give mouth to mouth.
C: Circulation - Look and feel for signs of circulation, check for the pulse of the person either on their neck or the wrists. If you cant feel a pulse than you will have to start chest compressions.
If you are not sure what to do, get help from somebody, the chances are they might know how to give first aid. If you would like to know more on how to give mouth to mouth and start chest compressions please click on the links below: