Mailing List Archive Mailing List Archive
WG ) obviously you know all of this stuff, but for everyone else ), the other guy came in and told us what happens to the oxygen ( it combines with carbon to become CO2 , also kown as "metabolism" ), but he confuses the issue by mentioning it as a gas when in fact it is transported in the blood as carbonic acid, and then released at the lung interface as CO2 again. This is why high "carbon dioxide" alters the blood PH to where the hemogloin will not do its job of transporting the oxygen, so we then depend on the blood plasma, which is why we then black out when the ppo2 falls in the prseence of high co2 ( as opposed to carbon monoxixde which uses up all four hemoglobin bonds and blocks normal transport of oxytgen). The point is that the sum of the partial pressures is imbalanced by the disappearing oxygen between bubbles and blood or tissues and blood. Also intersting , as long as we are talking about it, is the fact that high partial pressures of oxygen tend to block the the carbon dioxide escape form the cells ( why you feel "cramps" when you exert deep on the wrong gas, like air for example). Uno mas good reason to take back gas breaks. wendell grogan wrote: > > 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. > > > > > > > > > > > > > -- > > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > > -- > "There are two kinds of people, those who do the work > and those who take the credit. Try to be in the > first group; there is less competition there." > (Indira Gandhi) -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]