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Date: Wed, 5 Jun 1996 04:28:27 -0700
From: George Irvine <gmiiii@in*.co*>
Subject: How we get to low ppo2's was Re: What's a *safe* pPO2? (fwd)
To: "Peter N.R. Heseltine" <heseltin@hs*.us*.ed*>
Cc: techdiver@terra.net


  Peter, we are getting this direction from commercial diving companies, like 
Shell Oil, and others who have compiled the results of their experience with 
tox. There appears to be no firm guideline for time at a pressure, but there is 
one thing that we live by: there are virtually no cases below certain ppo2's, 
and the most liberal application of the clock theory gets us to a low ppo2
break 
way ahead of supposed limits for time over pressure.

  We feel that the risks of DCS are acceptable, the risks of tox are not. To
me, 
getting bent is just a good excuse to inmmediately do another dive, something I 
like to do. 

  I can only suggest that divers learn the physiology of the soprt, and the
best 
place to start is Bennett and Elliot, fourth edition, "The Physiology and 
Medicine of Diving". For MD's like you, there are references in here that you 
may find more tuned to your needs , and I believe the book is directed at 
doctors who are dealing with diving, but I am sure you know this, I only
include 
it for the benefit of others who are tired of reading complete and utter 
horseshit in the diving books written by strokes for strokes, and I commend you 
for pointing this out in your own way - you are exactly right.

  George Irvine

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