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From: trey@ne*.co* (Trey)
To: "wendell grogan" <docgrog@ya*.de*>, <techdiver@aquanaut.com>
Subject: RE: Nitrogen elimination and oxygen
Date: Fri, 20 Oct 2000 06:46:37 -0400
WG, for us the relevance of that is in knowing when to drop the pressure.
Obviously here hyperbaric oxygen implies hyperbaric surroundings. We found
that you reach a quick near limit at any given pressure, and continuation at
that pressure is not nearly as effective as reducing the pressure while
maintaining the oxygen window, as you point out.

I wonder why these messages are taking so long to clear?


-----Original Message-----
From: wendell grogan [mailto:docgrog@ya*.de*]
Sent: Wednesday, October 18, 2000 3:27 PM
To: techdiver@aquanaut.com
Subject: Nitrogen elimination and oxygen


I found the abstract for the first article and the
reference in DiveMed.
I think this is a typical case of trying to apply
basic research on the healthy body to a similar, but
not identical situation during an illness.
Basically, he is talking about the effect of
hyperbaric oxygen (supplied as an argon/oxygen mix-
not 100% O2) on elimination of nitrogen through the
lungs of normal people in a chamber.  The second
article, I haven't found, but the title suggests that
it deals with a state we already know is bad for deco-
hypercarbia (too much CO2).
The point of hyperbaric treatment is to eliminate
nitrogen bubbles, and then secondarily to eliminate
excess nitrogen so that the bubbles don't re-form when
the pressure is dropped back to 1 atm.  The research
didn't show that nitrogen stops leaving the body,
rather, it doesn't leave as fast when the subject was
subjected to hyperbaric oxygen as it did when he was
kept slightly hypoxic.  Further, there was no
significant difference in nitrogen elimination between
hypoxic and normoxic inspired gas.
Relevance to Nitrox- 0
Relevance to emergency use of 100% O2 on the surface-
0
Relevance to use of 100% O2 in hyperbaric treatment- 0
The most I could conclude from this is that increasing
the speed at which excess nitrogen in eliminated from
the blood in may not be among the many known benefits
of oxygen treatment for DCS.  This doesn't alter the
fact that for deco, the 100% oxygen clearly speeds up
elimination of nitrogen when compared to air because
1) it doesn't have nitrogen in it, and 2) the oxygen
window.
Wendell Grogan

=====
"Experts built the Titanic, but volunteers built the Ark!"
Pat Croce, Owner NBA Philadelphia 76'ers

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