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> It seems to me that any nitrogen initially in the loop or in the
> patient's lungs, or any outgassed during treatment, would remain in the
> loop.  This would reduce the effective O2 percentage to a point below
> 100%.  I understand that a standard practise with diving rebreathers,
> during decompression stops, is to periodically purge the breathing loop
> to eliminate excess nitrogen.  A similar practise is, I suspect, quite
> likely necessary with this treatment unit.  Has anyone looked at the
> manual for this unit yet?

I don't have a manual but I have an information booklet. It doesn't address
the issue of N2 but it does indicate that the O2 input is a constant stream
more like a semi-closed rebreather than fully closed. And the rate of O2
input is variable from 0.5 to 2.0 liters/minute. So I imagine you can dial
your own "purge" rate.

Devon

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