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Dr. Neal Harman writes:
> 
> Thanks to people here, I feel I've now got a reasonable basic, academic,
> understanding of mixed-gas decompression.  While causually reading the CDG
> manual the other day, I came across Reverse Gas Diffusion - the claim was
> that when diving specifically on Heliox, it was unacceptable to decompress
> on Nitrox mixes because incoming Nitrogen would inhibit the release of
> Helium already in the body - you should decompress on Heliox until shallow
> enough to use O2.

I've not heard of it being a practical concern for non-saturation
dives.  Take a look at _Physiology and Medicine of Diving_ (I use 3rd
Edition, can't bring myself to buy the new one.)  There's a good
description of "isobaric inert gas counterdiffusion" causing skin
bends due to counterdiffusion across the skin membrane.

Cheers,

Dave Story                        NAUI AI Z9588, PADI DM 43922, EMT
story@be*.wp*.sg*.co*	              Better diving through drugs.

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