Patients who experience full<unk>  with explicit recall may have suffered an enormous trauma due to the extreme pain of surgery. Some patients experience post traumatic stress disorder (PTSD), leading to long-lasting after-effects such as nightmares, night terrors, flashbacks, insomnia, and in some cases even suicide. Some cases of<unk>  alert the patient to intra-operative errors. A study from Sweden in 2002 attempted to follow up 18 patients for approximately 2 years after having been previously diagnosed with<unk>  under<unk> . Four of the nine interviewed patients were still severely disabled due to psychiatric/psychological after-effects. All of these patients had experienced anxiety during the period of<unk> , but only one had stated feeling pain. Another three patients had less severe, transient mental symptoms, although they could cope with these in daily life. Two patients denied any lasting effects from their<unk>  episode.
Anesthesia awareness
Pain tolerance
Neuroscience in space
Neural correlates of consciousness
Theories of general anaesthetic action
Affective sensation
Sense of balance
Sensory phenomena