<unk>  <unk>  is a state of confusion that occurs immediately following a<unk>  brain injury (TBI) in which the injured person is disoriented and unable to remember events that occur after the injury. The person may be unable to state their name, where they are, and what time it is. When continuous memory returns,<unk>  is considered to have resolved. While<unk>  lasts, new events cannot be stored in the memory. About a third of patients with mild head injury are reported to have "islands of memory", in which the patient can recall only some events. During<unk> , the patient's consciousness is "clouded". Because<unk>  involves confusion in addition to the memory loss typical of amnesia, the term "post-traumatic confusional state" has been proposed as an alternative. There are two types of amnesia: retrograde amnesia (loss of memories that were formed shortly before the injury) and anterograde amnesia (problems with creating new memories after the injury has taken place).<unk>  may refer to only anterograde forms, or to both retrograde and anterograde forms. A common example in sports concussion is the quarterback who was able to conduct the complicated mental tasks of leading a football team after a concussion, but has no recollection the next day of the part of the game that took place after the injury. Retrograde amnesia sufferers may partially regain memory later, but memories are not regained with anterograde amnesia because they were not encoded properly. The term<unk> " was first used in 1940 in a paper by Symonds to refer to the period between the injury and the return of full, continuous memory, including any time during which the patient was unconscious.
Post-traumatic amnesia
Excited delirium
Drug-induced amnesia
Childhood amnesia
Transient global amnesia
Memory distrust syndrome
Psychogenic amnesia
Emergence delirium