According to all the sources it is allowed to give oxygen with nasal cannula from 1 to 6 liters per minute, not more, to avoid damaging of the mucosa, and if you deliver oxygen generally at a rate more than 4 liters per minute you are supposed to humidify to avoid dryness of the mucosa. so my question is why it is not allowed to give oxygen with a nasal canulla at a rate more than 6 liters per minute if it is humidified?
Because nasal cannulas are hardly precise instruments. In fact, they are the least precise means of oxygen delivery (except blow-by for a newly born infant) They don't account for mouth breathing, and once you get to 6 liters they get damned uncomfortable.
As the rate increases, so does the 'blow' force.
Like a hurricane blowing into your nose!!! Besides the wind force, the noise would be crazy. And I think the tubing would also prob have water in it that would be sucked up like a nety-pot or spraying into the nose. !
In all my career, I don't think I ever ran O2 that high. Just NEVER.
This is a homework question, yes?
About 6 lpm is the maximum FiO2 for nasal cannula, which is .44
1 lpm = .24
2lpm = .28
3 lpm= .32
5lpm = .40
6 lpm = .44
7 lpm = .44
8 lpm= .44
HFNC is a different thing altogether.
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