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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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