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Eric (and others),

I appreciate your posting on this matter, however, no one has as yet
posted any factual physiological information on why a diver would be
hypoxic at altitude after a dive.  I'll probably get flamed for this,
but, while everyone praises all the "great" diving books like Deepr
Into Diving, they are in some ways just as bad as all the no-brainers
at the agencies, they give you information and expect you to accept it
without any of the deeper explanation behind it like *why* things
happen.  THis most recent discussion is just one example.  Now, if a
mechanism is not known, they could say, we don't know, otherwise, they
should provide better followup information.

>-when breathing high ppO2, the perfusion of blood is reduced to many 
>tissues (this is one reason why you do't get "full credit" for diluent 
>off-gassing when breathing O2-rich mix). If you suddenly change to low 
>ppO2s with the poorly perfused tissues, then you might have to consider 
>hypoxia.

I have been unable to find further references to hypoxia at altitude
(which was what originally started this thread somehow) other than the
one paragraph that Joan quoted from Lippman's book.  That paragraph
was talking strictly about air diving and said nothing about EAN.
Physiologically, the difference would be tough to determine since a
(relatively) deeper air dive would be equivalent to some shallower EAN
dive with respect to PPO2 on the dive and the possibility of resultant
hypoxia at the end of the dive.

Still haven't seen any medical types post on this issue either - where
are you (have all the knowledgable people deep sixed this list???)...

-Carl-

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