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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 __________________________________________________________________ Do You Yahoo!? Gesendet von Yahoo! Mail - http://mail.yahoo.de Yahoo! Mail auf Ihrem Handy? - http://mobil.yahoo.de -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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