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On Mon, 2 May 1994, Epic Dive Shop wrote: > rich, > > i appreciated your post on the narcosis, i have come to agree with you on > the nitrox buzz at depth... i also relate to your "cold" and "hot" > narcosis, pretty good analogy of what happens. i have a couple of > questions: the same thing has happened to me on trimix around 340fsw, > although my narcosis equivalent was less than 120fsw, i "suffered" > from your "cold" narcosis.. i have always thought it was from the > O2, even tho the ppo2 was 1.2 ... what are your comments on that. > > also, what is your thoughts on the CO2 contributions to the "buzz", > and how can we avoid it in the future... > > dennis Yeah, I've had somewhat similar experiences on trimix as well (usually with END of about 220 fsw or so) What was your mix? Was the oxygen/nitrogen ratio the same as air, or did you have a higher relative proportion of oxygen? As fo the CO2, yes I think this ultimately IS what causes the "cold" symptoms (part of the reason why they get more severe with exertion). This brings up another interesting point. I thought I was alone on this, but your message made me think otherwise....perhaps it would be a good question to pose to the trimix divers in this group. I've noticed on trimix dives with air + helium trimix (i.e. ratio of oxygen:nitrogen is 1:4, like air), that the narcosis at a given END is somewhat greater than the narcosis on air at the trimix END. (in other words, breathing trimix 10/50 at a depth of 430' causes more narcosis than air at 200', even though the air partial pressure is the same at both depths). Am I the only one who experiences this? Could this be due to the small contribution to narcosis of helium? I don't think it's HPNS because the same applies to shallower depths, where HPNS wouldn't be a problem. Anybody got any ideas? Aloha, Rich
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