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From: Jason Rogers <gasdive@sy*.DI*.oz*.au*>
Subject: Re: O2 tox vs CO2 blackout
To: jgibbo@ph*.lo*.ac*.uk* (John Gibbons)
Date: Thu, 1 Jun 1995 19:04:19 +1000 (EST)
Cc: techdiver@terra.net

Hi John;
You said;
****
I think that sometimes people forget that CO2 has a significant effect at
pressure on the CNS and can cause sudden blackout in poorly ventilated
divers working at depth. Some of the symptoms felt at low ppO2 (less than
1.6) might be attributed to CO2 and not O2
****
I agree entirely.  At the time I assumed that they were CO2 related.
Trouble is I don't have any evidence for it being CO2 acting alone,
CO2 acting with high O2, or just high O2.  Tunnel vision fits right
in with the VENTID thing but I may well be something of a CO2 retainer.
I am able to hold my breath till I pass out (only ever tried this on
the surface ;)  )  and I have found that I can double my breath holding
time by breathing pure O2 first. (7 minutes, no hyperventilation)

I could be something of an odd fish ;)
Cheers Jason :)

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