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Guys, any time you can introduce helium, do it - you are correct in spotting the risks in this one. High nitrogen pp's cause the red cells to get rigid, as well as make you dumb ( but you don't know it, a really dangerous dumb ), and the higher oxygen pp is even more risky. I like a low PPO2 with helium in the mix. The dive I just did I ran .99 ppo2, and a 100 ft aed. It is so cool to be able to think clearly 200 minutes ito a dive at 300 feet, and to perform properly. It is also nice to not tox, or even feel bad during the long deco that followed. They just don't teach this stuff the way you need to know it. On Mon, 28 Apr 1997, Drew Mooney <dmooney@cy*.ne*> wrote: >CHKBOONE@ao*.co* wrote: >> ><bunch of really hypmed stuff snipped> >> >> >> We sure could use some authoritative professional input here. If it turns >> out that O2 is not narcotic under the exposures we can expect to face >> (including trimix dives) then we are spinning our wheels here. >> If it is narcotic then the nitrox question is interesting. > >Chuck, > >I read in a George Irvine post, concerning methods and procedures used >by the WKPP that they mix their trimix for <=1.4 PPO2, and <=130' EAD. >Seems to me, a large percentage of nitrox dives probably exceed this >PPO2, and any deep air dive would certainly exceed both. > >Or were you implying OTU type exposure, as during a stupid long dive and >deco that these guys do every weekend? > >I'm asking this cuz it seems to me that trimix offers a distinct >advantage over plain air or enriched air - addition of the third gas >with narcotic properties a mere fraction of that of nitrogen, (and no >one has yet defined or quantified the narcotic properties (if any) of >oxygen. (Although I keep seeing a post from Dr. "Harris" Taylor run >through my mind...) in that you can tweak 3 variables to get a desirable >valuable for 2 of them, vice dealing with the trade off inherent to >using nitrox. - to limit your PO2, you gotta breathe more N2, and most >entry level nitrox breathers seem to have a hard time accepting the fact >that nitrogen poses far less risk than prolonged exposure to O2. They >don't teach CNS clocks in Open Water school.... > >Drew >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send list subscription requests to `techdiver-request@aquanaut.com'. > > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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