Chest compressions are a vital skill we teach on a first aid course. If a casualty is not breathing, call the emergency services then chest compression should commence immediately.
How to do good chest compressions: Find the mid point of the breast bone (sternum) and place the heel of your hand on the lower side of mid with your hand a 90 degrees to the casualty. Place you other hand on top of your first hand and interlock your fingers. Next bring your shoulders over your hands, lock your elbows and push directly down. (your head should be just the other side of the casualty). You're not using strength to administer the compression more or a rocking motion using your weight.
You should do 2 compressions every second, pushing directly down a third of the casualty's body depth. Stop if the casualty comes too, but don't stop unless; the situation your in becomes dangerous, somebody else trained in first aid can take over, you're instructed by a paramedic, nurse or a doctor to stop, a defibrillator arrives (in which case you would stop and put the defib on the casualty - turn the machine on and follow the verbal instructions), finally, if you are exhausted and can't continue.
I've posted a short video to help you with chest compressions
From personal experience I can tell you it is tiring, not just physically but mentally as well. After all you are dealing with a person on the cusp of life.
Most important thing to remember is to do something instead of just watching and wondering. Ideally, come and do a first aid course and you will learn chest compressions and many other skills. For advice, more information or bookings please email firstname.lastname@example.org or call 07770 376497
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First aid instructor