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<snip> > Wienke's "Diving Physics and Applications," page 197, he > lists the narcotic > potency of N2 as 1.0 and goes on to list the narcotic > potencies of other inert > gases (argon, neon, etc). He leaves the potency of O2 blank > though. Does > anyone happen to know what it is? Bennett & Elliot has a discussion of the Meyer-Overton hypothesis. Applying it to O2 gives you a narc pot. of ~2. For the metabolically inert components of the breathing gas (N2, He) inspired pp approximates to nerve junction pps. The important factor to remember wrt O2 is that it gets metabolised, so the nerve junction ppO2 will never be as high as the inspired O2. Arterial ppO2 is nothing like linear with inspired ppO2, just to complicate matters further. Assigning O2 a narc pot. of 1 makes the calculations simple (drop the whole concept of equivalent nitrogen depth, and use equivalent air depths). Alternatively, I believe GMIII considers O2 more narcotic than N2 - which is consistent with the MO hyp & high(ish) ppO2s. John Brett -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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