The article doesn't mention the impact of loss of oxygen to the brain. I would have to assume, that if this is moving to human trials, that there is evidence that this reduces or eliminates the effect of oxygen deprivation on the brain?
I would suspect that, since the whole method of action seems to be to reduce the cells' metabolic need for oxygen, there wouldn't be damaged from "deprivation" because the cells would still be getting all the oxygen they required.
Doesn't sound like they're using 100% H2S, I'm sure that would do all kinds of nasty things:
> he soon demonstrated that exposing mice to 80 parts per million of the gas mixed at room temperature made it possible to create a reversible suspended animation
