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In neurology, retrograde amnesia (RA) is the inability to access memories or information from before an injury or disease occurred. [1] RA differs from a similar condition called anterograde amnesia (AA), which is the inability to form new memories following injury or disease onset. [ 2 ]
The prognosis of "pure" TGA is very good, as by definition, symptoms resolve within 24 hours. It does not affect mortality or morbidity [29] There is no treatment specific to TGA. [4] "The most important part of management after diagnosis is looking after the psychological needs of the patient and his or her relatives.
Individuals with retrograde amnesia may partially regain memory later, but memories are not regained with anterograde amnesia because they were not encoded properly. [ 8 ] The term "post-traumatic amnesia" 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 ...
Traumatic amnesia is often transient, but may be permanent or either anterograde, retrograde, or mixed type. The extent of the period covered by the amnesia is related to the degree of injury and may give an indication of the prognosis for recovery of other functions.
Transient amnesia can be the principal manifestation of epilepsy. This diagnosis, however, is "seldom suspected by clinicians and remains controversial". [4] TEA is "almost always misdiagnosed" according to a leading authority. [9] In the largest study to date (2007) "Epilepsy was the initial specialist diagnosis in only 12 of 50 cases."
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Amnesia is an abnormal mental state in which memory and learning are affected out of all proportion to other cognitive functions in an otherwise alert and responsive patient. [5] There are two forms of amnesia: Anterograde amnesia and retrograde amnesia, that show hippocampal or medial temporal lobe damage.
As a result, Wearing developed both anterograde and retrograde amnesia. He has little memory of what happened before the virus struck him in 1985, and cannot learn new declarative knowledge after the virus struck him. As a result of anterograde amnesia, Wearing repeatedly "wakes up" every day, usually in 30-second intervals.