Eli5: When doing CPR, why does it help to breathe into the person’s mouth, when we exhale co2?

Question

Eli5: When doing CPR, why does it help to breathe into the person’s mouth, when we exhale co2?

In: Biology

Answer 1

I hope this comment doesn’t get deleted.

The air you exhale still has enough oxygen, in other words, it is better than nothing. And if you need to do CPR is because the patient gets nothing otherwise.

PLEASE NOTE: in my my last first aid training I was told that chest compressions are way more important than mouth to mouth. UNLESS you can use a mask or mouth barrier, you don’t give mouth to mouth.