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In: Biology
The amount of “well actually” in this sub is outstanding. Special mention to the folk correcting your/you’re. That’s truly the lords work
You still breathe out oxygen. Your body doesn’t completely filter out all the oxygen from a breath, it simply reaches equilibrium with the blood in your lungs. The blood gives up its CO2 and takes in the oxygen until your lungs and blood have the same ratio, and then you exhale more CO2 and less oxygen than you breathed in.
Mouth to mouth isn’t recommended the same way it used to be. You don’t take frequent breaks from chest compressions to breathe into them anymore.
I have always wondered how the air you blow into the victim during CPR doesn’t end up in the stomach ??
While this isn’t part of your question, you should know that mouth to mouth is no longer recommended.
Evidence has shown that chest compression are a much more important thing to do, so partly to encourage people to do chest compressions instead of mouth to mouth, it’s no longer recommended. You would rather have two people (or more) ready to do chest compressions (as these should be done without interruption until EMS arrives, unless told otherwise by AED obviously machine.) instead of one person trying to stick to mouth to mouth while the second person sticks to chest compressions and gets tired and ends up not doing them right. EMS still make use of the effect that mouth to mouth does, but they use those hand squeezed air pumps instead.
Yes its a legit problem, in my country all new first aid kits in public places must have a defibrillator and one of those respiration masks, and we were instrucetd to use those, in an emergency in which no tools are avaible mouth to mouth is needed but it still isnt efficient
when your blowing air to revive someone you actively blow much faster than you normally would so the oxygen concentration is even higher than you would normally exhale. so you act like a human ventilator machine
Air has 21% oxygen and about 0.05% co2 in it, the air we breathe out still has 16% oxygen in it, and 5% CO2. That 16% of oxygen is still more then the 0% of oxygen they are getting from not breathing. Obviously more oxygen is better, which is why trained professionals use a bagged mask that is connected to pure oxygen and help the patient oxygenate the blood this way during CPR, but mouth to mouth CPR is still better then no breathing at all.
The reason why we don’t use all the oxygen in the air is because our blood is already fully saturdated by the time we claim 5% of the oxygen, and so our blood physically can’t hold anymore, which is a good thing that we leave behind 16%, because that way if the air is really thin like up on a mountain or if the percentages change like when another gas is released and mixes with air, we can still breathe and survive for a bit because there is wiggle room. If we needed to use up all 21% of the oxygen in the air every time we breathe, then we would be in trouble if we breathed in air that only had 18% oxygen because it wouldn’t be enough and we would die
You’re also giving them oxygen they desperately need. It’s like topping up their gas tank with the good stuff.
The Red Cross recently increased the number of heart thrusts, because they discovered that pumping the blood is more beneficially than giving breathes. Someone already mentioned the oxygen capacity of an exhalation. That amount is plenty to put into the blood and pump for 20-25 compressions (it’s been a couple years since I was certified. Is it 20 or 25 now?)
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