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As people have said, there is oxygen exhaled.
The RCUK 2010 guidelines shifted from 15:2 to 30:2 as the first ten compressions were found to be less effective as the pressure builds up over those.
Lay responders were less keen to do mouth to mouth, so there was a push to support compression only. I think that was part of the 2015 update. The 2020 changes recommended no mouth to mouth and a face covering.
Mouth to mouth is in scope again, but there is lower appetite for it as compression only works.
All that said, in all the resus attempts I’ve done I have had equipment with me so I’ve always gone straight to BVM.
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