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John I recommed you maintain a po2 of 1.4 or less throughout the dive except for deco while physcially at rest. The problem is that the prediction of cns tox is not an exact science thus why risk it when it really does not even but a significant deco advantage. Tom At 05:40 PM 6/12/96 +0000, you wrote: >Tom, > >Thanks for the add'l info on the incident. I do have a few questions, however. > >When you refer to spiking pO2, would that be spiking to a pO2 above to what >the individual had experience with or an established value of 1.6 or 1.4? >The reason that I ask is that I will consider a 5 min spike to 1.6 at the >start of the dive and then 20 to 30 min at 1.4. CNS clock at the end of the >dive and deco would be moderate to low (<60%). Is this a practice that you >would back away from given what we now know? I am assuming there are no >other "personal" factors to consider such as medication, smoking, lack of >conditioning, etc. > >Regards, John > >btw: I subscribe to your Journal, but only since the begining of this year. >Many good articles. Didn't see the article you refer to (Caution! Do >Decongestants Threaten Your Dive Safety, by Tom Mount) as being available >online through your site which is why I'm poking for more info. > >>The incident at Devils Ear/eye was with a diver who spiked the po2 at one >>point but was within his CNS% clock. However he also had 3 times the >>prescription allociation of sudafed in his system and we have linked several >>close relationships of sudafed with diving accidents mostly on air. This was >>all published in IANTD journals three years ago. Bascially it comes down to >>several planning values the gas limits oxygen, nitrogen carbon dioxide and >>the effects of drugs ie decongestants etc and other drugs (even cigarattees >>with nicotine) that should be determiniung factors on a dive plan. >> >>Tom MountA > >
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