need answer fast
According to this, weeks at normal pressure, so you dont need it too fast. Its not good for you after a while but you dont exactly die immediately.
It gets used in diving when people get the bends as part of first aid procedures.
Otara
Patients with lung cancer etc can be put on 100% oxygen 24hr/7d for months, even years.
Why do they do that?
I would think that diminished lung capacity/efficacy means they need 100% oxygen rather than the usual 21% to get enough oxygen into their bloodstream.
Are you sure about the “100%” figure? Just because someone’s using oxygen doesn’t mean it’s pure 100% oxygen. The patients you see using facemasks to deliver oxygen are usually getting it in the range of 28 to 40 percent.
Early signs of lung injury are seen pretty much universally after breathing in >90% oxygen for six hours.
Likewise, breathing in oxygen at a concentration over 60% for 24 hours leads to detectable, deleterious changes in lung function.
Despite all this, sometimes your hands are tied - the patient needs the supplemental oxygen (his/her blood level of oxygen is too low without it) and if it requires a high concentration, so be it, i.e. whaddya gonna do, not give the oxygen and watch them die in minutes?
Thanks, I was being a FuzzyOgre and the obvious didnt occur to me. I was thinking it was more detrimental to cancer cells than regular ones.
I recently read they are experimenting with heating cancer cells to 50C or so for prolonged periods. They withstand heat worse than regular cells.
So nobody is going to chime in that it isn’t percentage, it’s partial pressure that matters? (IE purity doesn’t matter, it’s content per volume that does.)
I thought that high percentages of oxygen can cause ocular damage? My friend Stefan wears cokebottle thick glasses now, he was a preemie.
The people I’ve seen with lung cancer that carry around an oxygen tank aren’t on 100% oxygen. They have 100% oxygen pumped up to their nose where they get a little blast every few seconds, but it’s still getting diluted by the surrounding air.
I was going to but you beat me to it. Point of reference, at high altitudes 100% oxygen is not good enough it must be pressurised as well otherwise the pressure of the oxygen, even if it is 100%, is not enough for it to enter the blood stream in the lungs.
My Father was working in Hyberbaric Oxygen Therapy. I was under the impression that they used pure O2, the tanks were simply labeled ‘oxygen’.
The whole point is to bump up the partial pressure of oxygen, usually for about a ninety minute session. Treatment consisted of several sessions a week for a several weeks. Quite a bit of pressure, I seem to recall him saying the ‘dived’ patients to a hundred meters. Obviously lung damage would not be an acceptable side effect. I will have to ask him about the oxygen purity. The chamber was pressurized with normal air of course and the patient wore a mask or hood.
It is used generally to increase circulation, and actually results in permanent establishment of new capillaries. Typical patient was a cancer survivor whose treatment wounds will not heal without help. Also successful at saving diabetics from amputation if the problem in an extremity was caught early enough. They occasionally treated a diving injuries and CO poisoning.
That can happen, but almost exclusively in premature babies, where it leads to retrolental fibroplasia (also known as retinopathy of prematurity).
FWIW, the Wiki article on oxygen toxicityactually seems to be a cut above and is worth looking at.
IANAD, but speaking from personal experience, yes, I am sure about the 100% figure. Both from the labels on the canisters and on the machines that generate oxygen for home use.
Again, from my own experience: 100% oxygen, and it is released continuously, not in ‘blasts’. It can be diluted some if a cannula is used, but masks are not uncommon.
All these attempts at setting a time constraint… you could easily breath 100% oxygen for the rest of your life.
You can breath 100% nitrogen for the rest of your life too.
Heck… you can breath 100% water for the rest of your life.