Intraoperative<unk>  can present with a variety of signs and symptoms. A large proportion of patients report vague, dreamlike experiences, while others report specific intraoperative events, such as: * hearing noises or conversations in the operating room * remembering details of the operation * sensing pain associated with intubation or surgery * having weakness or muscle paralysis * feeling anxiety, helplessness, or an impending sense of doom Intraoperative signs that may indicate patient<unk>  include: * hypertension (high blood pressure) * tachycardia (high heart rate) * patient movement * tachypnea * ease of vascular access Patients under<unk>  are paralyzed if a neuromuscular blockade drug, a type of muscle relaxant, has been given as part of general<unk> . When paralyzed, patients may not be able to communicate their distress or alert the operating room staff of their consciousness until the paralytic wears off. After surgery, recognition of the symptoms of an<unk>  event may be delayed. One review showed that only about 35% of patients are able to report an<unk>  event immediately after the surgery, with the rest remembering the experience weeks to months afterward. Depending on the<unk>  experience, patients may have postoperative psychological problems that range from mild anxiety to post-traumatic stress disorder (PTSD). PTSD is characterized by recurrent anxiety, irritability, flashbacks or nightmares, avoidance of triggers related to the trauma, and sleep disturbances.
Anesthesia awareness
Pain tolerance
Neuroscience in space
Neural correlates of consciousness
Theories of general anaesthetic action
Affective sensation
Sense of balance
Sensory phenomena