Why is it necessary to let the chest fully recoil during CPR?
Answer:
Since pushing on the chest is pressing the heart between the sternum and spine, you need to let the chest recoil to permit the blood to re-fill the chambers before pressing the chest (pumping the heart) once more. Complete chest recoil is vital, because, as the chest rises, the negative pressure created actually "draws" blood back to the heart, much like pulling back on the plunger fills a super soaker. this allows for maximum possible output with each compression during CPR.
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