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> > > >On Sat, 7 May 1994 JOHNCREA@de*.co* wrote: > >> Rich, >> >> I know that many (if not most) agree anymore that HPNS is a pressure >> effect, and not due to helium. It is just that helium has so little >> narcosis (or CNS depressant effects, however you want to state this) >> that HPNS was only observed when we were able to get to these depths >> by using helium. At first these symptoms were attributed directly >> to the Helium, thus the original name "helium tremors". >> >> John > >I had not heard this before. But if it's true, why do Jean-Pierre >Imbert & the gang at COMEX reduce problems of HPNS by using hydrogen? I >can understand why trimix (i.e. He-N2-O2) reduces HPNS because the >nitrogen seems to have a counteractive effect (this falls in line >well with what Exley told me about his experiences). Would Hydrogen have >the same anti-HPNS effect as nitrogen? > >I'm a bit confused...... > > >Aloha, > >Rich > hydrogen is narcotic, and also has some other desirable properties for use as a diluent gas in diving David Doolette ddoolett@me*.ad*.ed*.au*
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