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A person experiencing TGA has memory impairment; with an inability to remember events or people from the past few minutes, hours or days (retrograde amnesia) and has working memory of only the past few minutes or less, thus they cannot retain new information or form new memories beyond that period of time (anterograde amnesia). [4]
A person experiencing a TEA episode has very little short-term memory, so that there is profound difficulty remembering events in the past few minutes (anterograde amnesia), or of events in the hours before the onset of the attack, and even memories of important events in recent years may not be accessible during the amnestic event (retrograde amnesia). [6]
Transient global amnesia is a well-described medical and clinical phenomenon. This form of amnesia is distinct in that abnormalities in the hippocampus can sometimes be visualized using a special form of magnetic resonance imaging of the brain known as diffusion-weighted imaging (DWI). Symptoms typically last for less than a day and there is ...
Because psychogenic amnesia is defined by its lack of physical damage to the brain, [16] treatment by physical methods is difficult. [7] Nonetheless, distinguishing between organic and dissociative memory loss has been described as an essential first-step in effective treatments. [1]
Although a TGA is scary for both patients and their families, transient global amnesia is a benign condition with an excellent prognosis. Jeff Hersh, Ph.D., M.D., can be reached at DrHersh@juno.com .
Anterograde amnesia can also be caused by alcohol intoxication, a phenomenon commonly known as a blackout. Studies show rapid rises in blood alcohol concentration over a short period of time severely impair or in some cases completely block the brain's ability to transfer short-term memories created during the period of intoxication to long ...
Twilight anesthesia is an anesthetic technique where a mild dose of sedation is applied to induce anxiolysis (anxiety relief), hypnosis, and anterograde amnesia (inability to form new memories). The patient is not unconscious, but sedated.
Although there was a general lack of knowledge about its mechanisms, a review of patients seen during WWI combat reveals the symptoms of post-traumatic amnesia (PTA) in many soldiers. The term shell shock was used to refer to the acute psychological state that accompanied exposure to exploding shells, and more generally, exposure to combat ...