I'm sorry...I don't have any experience with this myself.

What I have read from others in the past is that they get a pre-surgery block before any sort of necessary surgery. This, I have read, has the best chance of minimizing the risk of spread.

Unfortunately...there is still a risk of spread...which is just the nature of RSD. Even a bump can cause spread.

I would say that to prevent flare ups/spread...you are going to want to make sure you have some sort of sedation. You want to be as relaxed as possible and minimize the stress going in. There is always a risk of spread...but it doesn't happen every time to every person with RSD who has a procedure done. If this is something you need done, then you need to have it done.

Hope someone with more experience and knowledge about specific meds for a block can pipe in and share their experience.

Have you talked to the doctor about your concerns about spread/flares? Did they have any suggestions for you?