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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. > > > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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