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One of the better explanations I've seen.
Wendell Grogan
(a classic egghead type/Neurophysiologist)
Trey wrote:
>
> Jar Head, as a dope's explanation of the oxygen
> window concept for you Marines, the best gas
> differential would be a vacuum relative to a partial
> pressure, right? Oxygen is the next best as it
> creates a similar effect in that the sum of the gas
> partial pressures is unbalanced by the fact that
> some of the oxygen is metabolized, more in a fit
> person. The greater the difference between the
> oxygen and the other gases up to the max
> differential described by the metabolism ( maximum
> window ) , the greater the propensity for whatever
> is in the cells to come out and be displaced. For a
> fit person, the widow is wider and by definition so
> is his vascularity and perfusion, so he decompresses
> better. These things are all tied together.
>
> You open the widow as wide as possible subject to 1)
> risk of tox or damage, 2) how long before the vaso
> constrictive effect offsets the benefit, 3) how long
> before the asthma like reaction sets in. You then
> alternate the process back to open up the vessels
> and lungs again, and repeat. All part of a good
> deco.
>
> Also it can be said that the sum of the inert gases
> is the other side of the oxygen window minus the
> metabolism drop of oxygen- there is no benefit to
> combining inerts - they act like one gas. Oxygen can
> be pushed to above its partial pressure
> effectiveness as a result of this imbalance for a
> "window" that then exceeds what would be the net
> effect of the partial pressures of the gases, and
> this is especially important in diminishing bubbles
> of inert gas as the pressure of the bubble can
> always be faced with a negative gradient or
> "tension" on the outside due to the fact that
> metabolized oxygen is creating a "vacuum" in the
> total sum of the partial pressures of the gases,
> leaving a consistent imbalance between bubble
> pressure and surrounding tension of any given inert.
> This is why the shit works so well in DCS cases
> after the fact to reduce bubbles, as well as the
> fact that saturation with oxygen tends to move that
> gas to where it is needed even if the vessels are
> blocked by damage.
>
> Capice?
>
> This is the dummy's explanation so I do not want to
> have any of you smart ass cocksuckers coming after
> me , since none of you assholes has stepped up to
> the plate with anything but dogshit on here, and the
> fact is that if any of you understood this concept
> at a gut level like I do, you would be pulling out
> your IANTD books and using them for TP.
> -
>
> >I knew there had to be a reason for telephone
> psychics!
> >
> >Hey, can you put the "oxygen window" into words
> that a Jarhead can
> >understand and use for *normal* diving, as in 30
> minutes or less of
> >decompression? I have, at last count, 5 definitions
> of the concept, as it
> >applies to decompression. I have spoken to no less
> than 4 experts, and they
> >all have a different story, and none of them seems
> to float.
> >
> >(fuck it, the list is stale lately)
> >
> >Every time I start thinking I am getting a handle
> on all this, I read
> >another article by "Dr. ********, MD" and I am
> lost.
> >
> >Scott
> >
> >5 dangerous things to hear a Marine say:
> >A private saying "I learned this in basic..."
> >A Sergeant saying "Trust me sir..."
> >A Lieutenant saying "According to my experience..."
> >A Captain saying "Military Intelligence tells
> us..."
> >A Warrant Officer chuckling "Watch this shit..."
> >
> >
> >----- Original Message -----
> >From: "Trey" <trey@ne*.co*>
> >To: "David Freeman" <iopi.geo@ya*.co*>
> >Cc: "Tech Diver" <techdiver@aquanaut.com>
> >Sent: Tuesday, September 05, 2000 6:27 PM
> >Subject: Re: Decompression question was Re: 80/20
> nonsense
> >
> >
> >> When and if one develops the need to talk to me
> >> about deco, one then will find one knows my phone
> >> number somehow.
> >>
> >> Funny how that works.
> >
> >
> >
>
> --
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