[thomasfedb]

Contrary to the myth, general anaesthesia does not in fact fully defeat physiological responses to painful stimulus.

I've watched first hand as the anesthetist has said "whatch the monitor as the surgeon does this bit" and seen the response.

[derefr]

Not at the levels we like to use for surgery, certainly. But my understanding is that a “medically-induced coma” (the potentially-irreversible palliative-care kind) does suppress all pain signalling. Likewise, people in a vegetative state have no physiological response to pain. If you completely suppress central functioning, then you completely suppress pain response.

(There might still be a local release of pro-inflammatory cell-danger-response purines from the wound site that do things when they hit various organs/tissues on their way through the circulation, but I believe we don’t tend to call those “pain signals”, for the same reason we don’t call them that in plants or fungi.)

[dublin]

Some anesthesiologists believe that, but there's really no solid evidence for it. The reality is that no one really knows how or why anesthetics work, we just know what generally does work. I was told this by an honest doc, who also told me this scary fact: Because it's best to minimize the drugs that put you under (especially gaseous), and b/c we're getting better at walking that line, it's increasingly common to have patients wake up and freak out at the sight of their chest spread open. That's why the anesthesiologist keeps a couple of loaded syringes on the cart ready for emergency use: one is an instant paralyzing agent, the other a powerful memory blocker.