I suffered an incomplete (cervical) spinal cord injury years ago.
Through my 'medical journey' and many many months in the ICU before rehab I was placed on a variety of amnesiacs, as well as induced comas.
I remember a lot of things that I really shouldn't -- and I can corroborate the events with eyewitnesses who were otherwise healthy spectators.
I was terrified, unable to communicate, uncomfortable, and most of the time in pain.
When I was finally brought back to 'real' consciousness I had tubes in every orifice, a new tracheotomy, a new HALO drilled into my skull, the inability to speak and the inability to move my arms -- through no ones direct fault my only means of communication , my voice , was taken from me while I was pharmaceutically inebriated and unable to consent -- an emergency action that was medically required.
I eventually regained enough upper limb movement to communicate with a small whiteboard and soft erase markers while in the medical facilities. When the trach was finally removed I regained most of my voice within months of therapy, but the memories and experience still haunt me.
I sincerely hope that we learn enough about human consciousness at some point to allow us to better manage patient awareness and memory forming through trauma -- I think that the medical industry as a whole kind of pushes 'medical PTSD' out of the public arena of consideration as something that is 'required, known, but terrible.' -- but I hope we one day come up with real methods of reducing or preventing that kind of experience all together.
It feels that at this point we're much more adroit at healing bodies than psyches.