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Date: Wed, 17 Jun 1998 04:05:55 +0200 (MET DST)
To: techdiver@aquanaut.com
From: Hans Petter Roverud <proverud@on*.no*>
Subject: Re: Narcosis tollerance
At 16:14 16.06.98 -0400, you wrote:
>I went to the denist yesterday and was put under with nitrous oxide(N20,
>laughing gas) and before passing out I could not help but notice that it had
>virtually the same effect as nitogen narcosis.  

That observation is right on -- in fact, nitrogen narcosis exerts its effect
through exactly the same mechanism as nitrous oxide intoxication. Various
lipid soluble gases start impeding nerve signals at different pressures.
Xenon gives deep anesthesia on the surface; nitrous oxide gives deep
anesthesia at about 1.5 atmospheres. Since it's impossible to sink down to
deep anesthesia breathing nitrous oxide (+ a healthy amount of oxygen) on
the surface, your "passing out" at the dentist's might have been the
equivalent of a 170' - 300' air dive. You may be in a stupor, numb, hypnotic
(idea fixation) etc. but you are not totally out. Nitrogen (air) gives deep
(complete) anesthesia at 400' - 500'. Argon is about twice as narcotic as
nitrogen.

>Now when diving deep on air
>it is always said that one should work ther way down slowly dive after dive
>in order to build up a tollerance for the narcosis.  While it may not be
>wise to inhale N2O on a regular basis wouldn't help one to build up a
>tollerance for narcosis. Thanks in advance for your comments.

As others have said, while you won't increase your tolerance to any
significant extent, you might be able to learn to get a grip on yourself and
work within the limits imposed by the intoxication. It's amazing what can be
accomplished if you slow down, however, since "slow" is the only pace you're
capable of, it's equally amazing how you draw a blank the moment trivial
problems come two at a time. While Cousteau's "Rapture of the Deep" may
sound cool, gas anesthesia is its real name. Are you sure you want to dive
under the influence, clench your teeth and make the best of it? Think
"nitrous oxide" while you make that decision; it's the same thing! ;-)

regards,

Hans 

 
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