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>From the message below:
>
>"You may be confusing the "oxygen challenge", whatever that is, with a test

>>> >of pressure.  The test of pressure is done in a chamber when DCS is
>suspected.
>>> >If the victim feels better when pressurized to say, 30', then the pain

>is
>>> >probably DCS and NOT something such as overuse or a bruise.  If there is

>no
>>> >improvement at 30' or 60', then the problem is NOT DCS.
>
>Question: should all DCS symptoms disappear when the victim is recompressed

>(therefore eliminating the possibility of DCS if the victim does not show
>any improvement during the "pressure test")? My question is related to an
>article about the immune response to bubbles and symptoms of DCS even after

>the bubbles were already treated.
>
>Regards, Sergio


Sergio,

Good question.  The answer is that you are on the right track.  If the symptoms
go away with O2, then return when O2 is stopped, then its probably DCS.  If
the symptoms go away with recompression, then it is likely to be DCS.  However,
the opposite is not true.  Think about it, if all DCS symptoms went away with
recompression to 60fsw, then no one who got to a chamber before they died would
have any permanent problem and no one would die after reaching the chamber.
 It simply isn't true.  This is one of those situations where you can prove
the positive (DCS) but not the negative (not DCS).
Wendell
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