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Scott, Trey

Thanks for your post.  I'm not quite sure what you meant by:

> >     The teams CNS O2 Toxicity Clock what somewhere between 15 to 20,000
> > percent of maximum, the same "clock" was used.

Could you explain your present thinking on O2 clock and OTU's based
on WKPP diving experiences?

Don W.


Trey wrote:
> 
> Scott, on that dive I did 8.5 hours of deco from the fist stop at 240
> feet. Bottom time was 6 hours at 285-300 and we had 10 minutes of run
> time to get to the bottom. Total time in water for me was 14 hours and
> 10 minutes. I was back home in Lauderdale the next morning.
> 
> I ran a bottom PPO2 of < 1.0, and a deco PPO2 of 1.6 max . I did back
> gas breaks every 20 minutes from the botttom for 6 minutes, and two 20
> minute back gas breaks - one prior to the 120 stop and one at 50 feet. I
> cut the 40 foot stop to 20 minutes and then did 150 minutes on
> oxygen/18X35 trimix at 30 in the trough by going 12 on 6 off, and did a
> stratght ascent to the surface from 30 ( we do not do that anymore). No
> ill effects what so ever, and I was able to work out at my full rate the
> next day.
> 
> Scott Hunsucker wrote:
> >
> > 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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> 
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