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Drew, You wrote: >Seem to recall reading somewhere that a little nitrogen in the mix >reduced the risk of HPNS. >Drew I don't think HPNS becomes an expected problem except during or after compressions more rapid than a diver normally experiences. Or perhaps during longer exposures as well. It seems to be primarily a chamber phenomenon experienced by working divers and embraced by a lot of tech divers for it's usefullness in bragging sessions. I have also read that a little nitrogen reduces the effect of HPNS and I have never heard of a diver experiencing it. However a smart diver who did would probably never know for sure unless he was undergoing controlled testing because the initial symptoms (tremmors & twitches) are similar enough to the onset of CNS O2 tox that it would surely run him out of the depths as fast as his little legs could carry him. NO! I'm wrong on that - the smart diver will use the BC to get up since a CO2 build up will likely put you into red field vission or convulsions pretty fast at this point . Chuck -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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