CPR manually oxygenates the blood and pushes it through the body so that we can try to stop brain death for as long as we can. Essentially you are mimiking a heart beat through chest thrusts. But the heart is still not beating right, just beating on the chest won’t fix that. Thats where the defibrillator comes in – it shocks the heart in a way that makes it spontaneously beat again.
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