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Dry you can take a lot. Wet shows seizures above 1.4 working, and 1.6
not wroking ( from commercial diving ). The pulmonary problems are still
there , however, and that is why they do the breaks in dry chambers.
Wet, you need the breaks for both reasons.



Drew Mooney wrote:
> 
> On the subject of the chamber,
> 
> If any of you folks doubt the narcotic properties of O2:
> 
> I recently had a chance to participate in three chamber rides in Houston, TX.
> The first time down, somewhere between 40 and 60' on pure O2, I got higher
than
> a kite. Stupid. Made my widest nitrogen induced drool-faced grin look like a
> mere smirk. I'm talking silly. The attending nurse said she sees it all the
> time when I asked her about it later.
> 
> john.r.strohm@BI*.co* wrote:
> 
> > The guest speaker at the local dive club last night was Dr. Jeff Stone,
> > director of the hyperbaric chamber at Presbyterian Hospital here in Dallas.
> >  His talk was about wound treatment using adjunct hyperbaric oxygen
> > therapy.
> >
> > One of his slides showed their standard treatment profile.  A patient
> > typically does 10 treatments.
> >
> > 45 fsw.  30 min on 100%O2, 5 min air break, 30 min on 100%O2, 5 min air
> > break.  O2 is given in a mask or in a hood.
> >
> > He even had the number on another chart:  2.4 ata ppO2
> >
> > When I asked, he said they saw CNS oxygen toxicity hits about 1 out of
> > every 15,000 treatments.  He added that a lot of chambers just kept the
> > patient on pure O2 at 45 fsw, but they did the air breaks specifically to
> > reduce the risk of CNS ox tox.
> >
> > This may or may not have any relevance to diving in water as opposed to in
> > a dry chamber.
> > --
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> 
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