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Date: Mon, 2 Oct 1995 05:46:37 +1000 (EST)
From: Bernie Woolfrey <woolfrey@oz*.co*.au*>
To: Carl Heinzl <cgh@ma*.ai*.mi*.ed*>
cc: rfarb@em*.un*.ed*, amontgom@ha*.ed*, saphire@ix*.ne*.co*,
chris@ab*.co*, techdiver@terra.net
Subject: Re: Nitrox and high altitude diving

	If you are breathing a high PO2, and ascend rapidly to the point 
where the PO2 drops significantly, it is possible to get a "reversed" O2 
gradient. O2 can start to move out of your body and you can become 
hypoxic. This is what happens to breath-hold divers as the PO2 in their 
lungs falls during ascent after a long dive: shallow-water blackout.
	The key is that the the PO2 has to drop below thw .16ata or so 
threshold...as in the long-staying breath hold divers ascent. I don't 
understand how it would work when changing from one breathable medium to 
another, as in an ascent from any dive.
						Bernie Woolfrey

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