@tbs,
yeah this dude means something else though, or actually the same thing (snipping the nerve) but at a lower level, therefore not only cutting off the sympathetic nerve for the upper part of the body, but also the lower.
I'm already very sceptical about ETS in general, but you don't have to be a rocket scientist to realize this lumbar sympathectomy is just insane.
I've read from another Dutch guy some time ago though who had ETS just on one side (on the right side, since you use that hand the most obvioulsy) and he was quite happy with the results. He also said the sweating in his left hand had decreased significantly as well and he didn't go back to have the left side done afterwards.
I don't know about the long term though. I kind of lost track of the Dutch forum, last I checked in most are stuck using oxybutynin with inconsistent results. Personally I think I have to set myself some kind of deadline to consider ETS. I don't want to do it and I still think HH is a solvable problem if only the medical world put some real effort in, but if this goes on for another say, 10 years...I guess I'll have to take the gamble some time in the future.