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Date: Tue, 4 Jun 1996 19:01:06 -0700 (PDT)
From: "Peter N.R. Heseltine" <heseltin@hs*.us*.ed*>
To: George Irvine <gmiiii@in*.co*>
Subject: Re: What's a *safe* pPO2? (fwd)

George,

Many thanks for your mail. The picture is really quite clear. Divers with
smarts limit their pPO2s as you have described.There is remarkably little
variation in the posts I have received from UK, Australia, US, commercial
divers and others.

I recognize that the commercial diving community consider tech divers with
about the same enthusiasm that farmers look upon rabbits, but I am still
on the track of some facts. At present we are getting *opinions* and some
of these (published in sport diving magazines and such) from former air
diving record holders. I am as happy with this as I would be with a mail
order ski course from Jean Claude Killy! As a physician who examines and
advises sport divers, I would like to be able to have facts on which to
base my advice. I will use connsensus in the absence of cases and your
post, as well as those of others are very helpful.

If sport divers keep to the training that PADI and IANTD give, i.e, plan
to limit your pPO2 to 1.4, then I doubt there will be many problems. My
concern is that even divers not likely to push their limits will read
Brett's comments and interpret the Navy upper limits for a working dive as
the MOD for their next nitrox dive.

So, if I can verify that commercial divers limit their pPO2s based on
experience, then hopefully I can persuade Weekend Wakulla Wannabees that
planning on a pPO2 max of 1.4 might save their health , if not life.

Again many thanks for your e-mail,

Peter Heseltine, MD

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