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Esat, we just overcome that by starting our helium at 30% minimum. IE, no matter what the calculation, the least helium we use is 30%, and we use helium in all bottom gasses regardless of depth. This is because we have found impairment with all air and nitrox mixes at all depths, and suspect damage at all depths unless helium is in the mix. Very unscientific, but very, very effective. Esat Atikkan wrote: > > Obviously O2 is metabolized. However not all O2 > partitioned in the body is metabolized - this becomes > particularly true when the ppO2 exceeds the O2 > required for metabolism - a situation wh/ is bound to > occur as ppO2 increases - say w/ depth. > > Thus, except for that threshold effect, O2 should B > treated as a narcotic component of respired gas & > inluded in END calculations - "how" may B the more > difficult issue. > > Safe bubbles > Esat Atikkan > > --- "Michael J. Black" <mjblackmd@ya*.co*> wrote: > > According to the Meyer-Overton hypothesis, narcotic > > potency of gases > > correlates with lipid solubility, and O2 has a lipid > > solubility of > > 0.11 (about the same as Argon, 0.14). Helium, in > > comparison, has a > > lipid solubility of 0.015. You all know how > > narcotic Argon is (very), > > and how non-narcotic Helium is. O2 is predicted to > > be about as > > narcotic as Argon by this hypothesis, except that O2 > > is not inert, > > and is readily metabolized. I believe that is why > > there is no > > listing of relative narcotic potency for O2 in the > > textbooks (I am > > looking at Bennett's chapter on Inert Gas Narcosis > > and HPNS, in Bove > > and Davis' Diving Medicine, 2nd ed.). It is listed > > as blank because > > the comparison is not valid. Mike Black > > __________________________________________________ > > Do You Yahoo!? > > Talk to your friends online with Yahoo! Messenger. > > http://im.yahoo.com > > -- > > Send mail for the `techdiver' mailing list to > > `techdiver@aquanaut.com'. > > Send subscribe/unsubscribe requests to > > `techdiver-request@aquanaut.com'. > > > __________________________________________________ > Do You Yahoo!? > Talk to your friends online with Yahoo! Messenger. > http://im.yahoo.com > -- > 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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