Saving after ingesting N

[Minsu]

If someone takes a lethal dose of N and ER is called for saving him, how likely is it to get him back from coma?
Or is it as irreversible as KCN?

 

[DepressedChemMajor]

You can certainly survive N and even get out of coma if you're given the proper treatment early. Also, KCN is very reversible if found early, infact SN was (still probably is in some countries) used as an antidote to cyanide poisoning