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Hello Ben,
An interesting post, I would be interested , too, in further references.
Btw, what did you do, add a small amount of CO2?

Do you have any guess where and when this german paper was published ?
I know some anaesthesiasts here who could help find it .

Matthias

Ben Greenhouse schrieb:
>     I used to work in an Anaesthesia research lab, and we found in one
> of our studies (and then looked hard and found it in an old German paper
> who's author I can't remember) that patients would hyperventilate ever
> so slightly when placed on pure oxygen.  We though it was an error in
> our readings, perhaps due to different gas densities between oxygen and
> air, so tried to back calibrate, but to no avail.  Then we found this
> old paper that described this phenomenon.  Hyperventilation from pure O2
> will cause a slight hypocapnia which will cause vasoconstriction.  We
> developed a circuit that could keep this drop in CO2 from occuring
> despite an increase in ventilation.  I can send references if either of
> you are interested.
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