Just wondering whether it's safe to go under general anesthetic if you suffer from PCS (or after recovery). Can the anesthetic re-trigger symptoms, given that we are "once concussed, always concussed"?

I think the author of Brainlash mentioned this as a potential area for further research. Obviously, there will be times when general anesthetic will be necessary (ie, for an essential operation), but I'm wondering if it's something to be avoided where possible.