Never did find that chapter on mitochondria. However, thanks and I am now very interested in HBO (not the television kind). I was explaining to someone: it's like this: if a guy can't s**t, he can eat all he wants of the best food there is, and he's still gonna die. So having pure oxygen is like having the best food there is. If your blood can't drain you're out of luck.
I do find it interesting, since it sounds a bit like, instead of eating, getting an injection of nutrients already digested into your bloodstream. Maybe in that sense it can help some. I'd still like better veins.
The neat thing is it sent me on the trail of SPECT radiography, and I found a couple of good papers. Here is one: SPECT-paper