2. intro
A lack of memory = memory loss
Antegrade amnesia - a lack of memory of
events occurring after a traumatic event
retrograde amnesia – a lack of memory of
events that occurred before the event.
3. Antegrade amnesia
• Amnesia in which the loss of memory relates
to events that occur after a traumatic event.
• There is inability to recall new information.
• Old information can be recalled.
• Antegrade amnesia may follow brain trauma.
4. Transient global amnesia
• A passing episode of short-term memory loss without other
signs or symptoms of neurological impairment.
• In transient global amnesia (TGA) the individual does not
lose consciousness but does lose the ability to form new
lasting memories.
• Motor function is not affected.
• the individual may be disoriented to place and time, may
recognize that something is wrong, and may become
distressed at this realization.
• The average age of patients with TGA is 62 (range: 47-80)
and t
• the mean duration of the episode is 5.7 hours, with a range
of 20 minutes to 20 hours.
5. The recommended criteria for the
diagnosis of TGA are:
• Attacks must be witnessed and information must be available from
a capable observer.
• Clear-cut anterograde amnesia must be present during the attack.
• Clouding of consciousness and loss of personal identity must be
absent and cognitive impairment must be limited to amnesia.
• There must be no accompanying focal neurological symptoms or
signs, and epileptic features must be absent.
• Attacks must resolve within 24 hours.
• Patients with a recent head injury or known active epilepsy are
excluded.
