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Martin, et.al.,
I am glad to see a discussion beginning on here about this very real
problem. This is my main area of research interest in the WKPP, and one
that many people don't seem to take seriously.
Martin has included some very useful information that has been in use
for many years. He is correct in stating that the values expressed are
conservative. Hopefully, the science of diving will catch up with the
"real world" of diving and we can all benefit.
I recently presented at the Undersea Hyperbaric Medical Society-Gulf
Coast Chapter's Annual Scientific Meeting in Atlanta. I used data from the
world record dive performed in 98. After 18,000 feet in Wakulla, a BT of
five hr at 300' and the subsequent deco of 16 +/- hr, here is what we had:
The teams CNS O2 Toxicity Clock what somewhere between 15 to 20,000
percent of maximum, the same "clock" was used. I give you the range due to
fact that we can not calculate the back gas breaks used, this prevents us
from giving a truly accurate number. Never the less, this is a value well
over the established "limits" as expressed in the clock. The deco was all
done in water/trough/habitat, not in a saturation chamber or transfer
bell. There was not one incident of CNS toxicity.
The daily dose limit of OTUs was reached before the 190' deco stop. I
did not calculate the time remaining from there, but I would say approx 14
hr or deco were left. Only very minor occurrence of mild pulmonary
tox. Compared to the dives of prior years this was not a problem. Again
back gas breaks and correct gases are the key.
The room full of physicians and chamber operators did not believe us
either. There were a few that had their interest sparked, but it appeared
as if the world of diving medicine was not ready for us.
What can you learn from this long winded chat, take religious back gas
breaks during deco, use the correct gases, and know what you are doing. I
am not recommending that anyone just blow this stuff off because a few
people did it w/o problem. Stay w/ in your limits and dive safe, just be
sure to also dive smart.
Have a nice day,
Scott Hunsucker
At 09:00 PM 02/08/2000 -0500, Martin M. Quigley wrote:
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