Loss of the ability to recall information that had been previously encoded in memory prior to a specified or approximate point in time. This process may be organic or psychogenic in origin. Organic forms may be associated with CRANIOCEREBRAL TRAUMA; CEREBROVASCULAR ACCIDENTS; SEIZURES; DEMENTIA; and a wide variety of other conditions that impair cerebral function. (From Adams et al., Principles of Neurology, 6th ed, pp426-9)

Synonyms: Amnesias, Pre-Ictal, Pre-Ictal Memory Losses, Amnesia, Retrograde, Memory Loss, Pre-Ictal, Pre Ictal Memory Loss, Amnesias, Retrograde, Retrograde Memory Losses, Pre-Ictal Memory Loss, Memory Losses, Pre-Ictal, Pre-Ictal Amnesia, Pre-Ictal Amnesias, Memory Losses, Retrograde, Retrograde Amnesias, Retrograde Memory Loss, Amnesia, Pre Ictal, Memory Loss, Retrograde, Retrograde Amnesia, Amnesia, Pre-Ictal