| Effects of Helium content on O2 Toxicity suceptibility
As the title says - does anyone know if there is any research into the susceptibility of a diver to an O2 hit with regards to anything other than just the PPO2 of the breathing gas?
Was thinking about bailout gasses, and in particular if there is any difference in tox liklihood if you switch to a particular PPO2 gas, depending on if it is a Nitrox, Trimix or Heliox blend.
Was wondering if perhaps the narcosis/numbing effects of a higher PPN2 might delay the onset of a hit, and that you might be better switching to a He lean mix if it is a bit hot, rather than a He rich one? Obviously there's the issue of IBCD if the He is too lean (the N2 spike is too high), but I'd like to keep that out of this discussion for now...
Any thoughts? |