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In: Biology
Aside from all the comments that have pointed out that you still exhale a good amount of oxygen, it’s actually not recommended that you do mouth to mouth resuscitation as a bystander during CPR anymore, the chest compressions are the important part. A bunch of studies were showing that mouth to mouth resuscitation wasn’t really doing much if anything. That was like 20 years ago.
[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071045/](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071045/)
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