45 Minutes of CPR...

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In general they've decided that doing correct and effective chest compressions means you don't need to do rescue breathing anymore.
The switching back and forth, losing momentum, etc was hurting more than the CPR was helping...

Also the air that you are exhaling contains less oxygen than the ambient air which will be forced into the lungs by chest compressions. Several countries have already adopted compression-only as the official policy, the rest will follow
 
https://www.shearwater.com/products/teric/

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