Areas of hypoperfusion, seen above in the left sided hippocampus (seen as white punctate lesions on diffusion weighted MRI) are a characteristic finding in Transient Global Amnesia
Specialty
Neurology
Symptoms
Memory impairment
Complications
Usually no long term sequelae
Usual onset
Sudden
Duration
Less than 24 hours
Causes
Unknown
Diagnostic method
Clinical diagnosis, imaging may aid in diagnosis
Treatment
Reassurance
Medication
None
Prognosis
Good
Transient global amnesia (TGA) is a neurological disorder whose key defining characteristic is a temporary but almost total disruption of short-term memory with a range of problems accessing older memories. A person in a state of TGA exhibits no other signs of impaired cognitive functioning but recalls only the last few moments of consciousness, as well as possibly a few deeply encoded facts of the individual's past, such as their childhood, family, or home perhaps.[1][2]
Both TGA and anterograde amnesia deal with disruptions of short-term memory. However, a TGA episode generally lasts no more than 2 to 8 hours before the patient returns to normal with the ability to form new memories.
^Logan, W; Sherman, D (1983). "Transient global amnesia". Stroke. 14 (6): 1005–7. doi:10.1161/01.STR.14.6.1005. PMID 6658982.
^Hodges; Warlow, CP (1990). "Syndromes of transient amnesia: towards a classification. A study of 153 cases". Journal of Neurology, Neurosurgery, and Psychiatry. 53 (10): 834–43. doi:10.1136/jnnp.53.10.834. PMC 488242. PMID 2266362.
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