I spent 'Early time' with Dr S, in Philly. Back then, (late 80's) he was beyond using blocks for anything but diagnoses. I truly believe that they're useless for anything but that, besides an income for the Doc/hospital.
He used them on me, upper left, and lower right. (I think i got that right, it's been so long). But, even way back then, NOBODY, ever thought blocks as a treatment!
They're only Diagnostic!
What's going on here? They're still selling blocks to us and our Ins. Companies? No wonder our Ins. co's are so skeptical!!!

They don't solve anything, and can cause the 'spread'!!

For Cryin' out loud!
What are these 'Apprentice RSD Docs' doin?
They're pissin' off our Ins. Companies, that's what!

No, I don't believe they do anything other than diagnostic. NEVER a cure, or even a Treatment!
Who are they kidding?

Not us!
Blocks are about as useful as loosening your laces on your sneakers, as a treatment!
They can determine, where your RSD is based, beyond that, forget it!
This is only my opinion, but, being around some of the best RSD docs in the world, this is my conclusion.

I would NEVER have a 'nerve block' as treatment!
NEVER!

There are other treatments that are more effective, efficient, and cost effective! Don't buy into this 'block syndrome' that some of our Beginner doctors seem to be stuck in......

All the Best....

Pete
asb

PS, sorry if I'm a bit adamant about the whole 'block' thing.... I been there.