Is there any other method which doesn't leave permament damage like SN?

[x-Ace-x]

I don't know a single method which most likely won't leave a permament damage to the body. In hanging, if you are rescued after few minutes or the rope breaks, there's a high risk of brain damage because of the deprived oxygen from brain.

Of course, we can't be sure 100% that SN won't leave any permament damage but so far I haven't seen any case where the patient isn't left brain-dead and with serious damage.

What do you think? Is there any other method which has a very slim chance of not leaving you with the permament damage? Nitrogen method maybe?

 

[ZardozOmega]

Most of the methods you posted work by limiting the amount of oxygen that reaches the brain, so permanent damage is almost always a possibility.