@janegul I am not an expert, nor am I a physician. However, I don't see how scoliosis can have a substantially detrimental effect on the passage of a catheter up your femoral vein to your heart. After all, your own blood doesn't seem to have any trouble with that path!

I can't address your concerns over anesthesia, but I do think you are right to at least inquire and to be wary. My own father was recently in hospital and was being told he might have to have surgery under a GA. He mentioned the caution typical for well-ripened seniors, but the internist said it was a lot of hogwash. No worries, he said. It may be true that some aged people won't do especially well under GA, but I suspect they have other problems that a GA would likely exacerbate.

And if the worse comes to the worst, some anesthetists can snow you just enough that you're fully sedated but not 'out'.