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Rich, I would like to defer this to people like Doolette
and Lowrie. I know a little about a lot, but not a lot about
each thing. My job is to keep me and my boys alive and
well. I defer to others for the specifics.
However, my general understanding is that the
effect is similar to surface tension on a liquid, or at
at interface. The high pressures of nitrogen seem to
cause the RBC's to become rigid, and therefor either
jam in the small capillaries, or scrape theri way
through. I have seen this on film under the microscope,
and know it to be true.
There is some question as to why the presence of
helium greatly diminishges this effect - that is the part
that is less well understood. Remember, calling nitrogen
an "inert" gas is not the same as calling helium inert,
and then we are talking about effects under pressure,
which again are a whole other ballgame. There is
no telling what kind of polymerization is taking
place that we can not see or measure...
Let it suffice to say that I know it exists, that is
why I don't dive deep on air, I even hate the deep air
deco, and this may be the reson we feel so tired after
a good deep air exposure. - George
.
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