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> Rich, can you tell me what it feels like and what do you think the 
> numbers may be? ..... Thanks, Pete

I don't know about the numbers, because I think it varies enormously from 
person to person, and within a person under different conditions.

As for the symptoms I experienced, they happened during treatment for my 
bad DCI case in 1986.  I was exposed to 28 consecutive treatments, each 
of which inlcuded a deep spike on nitrox, plus 4 hours at 60 feet on O2 
(with air breaks every 20 minutes), plus a couple more hours on O2 at 30 
feet.  About mid-way through the treatment series (i.e., after about 2 
weeks of these), I had a wide range of syptoms, including extreme nausea, 
numbness at the tips of my fingers, and difficulty hearing.  Most of 
these were likely something related to CNS O2 toxicity, but I also had 
irritation in the lungs when I tried to take in a full breath. It was 
sort of a dull ache in my lungs most of the time, intensifying to a sharp 
burning sensation on full inhalation.  All of these syptoms gradually 
intensfied during the course of the month-long treatment, but would 
subside during the periods between successive chamber treatments.

> BTW, how's the diving been lately?

Not much lately, but all next week I'll be doing a series of deep dives 
on the Island of Hawaii. Should be a blast - I need it!

Aloha,
Rich

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