![]() ![]() The major differential diagnoses for TGA includes other transient amnesic conditions such as TIA, transient epileptic amnesia (TEA) and psychogenic amnesia. As previously mentioned, the episode may or may not be associated with some triggering event. No other causes for amnesia must exist-patients with recent head injury or active epilepsy (medication or seizure in the previous two years) are excluded.Īssociated symptoms (headache, nausea, dizziness) and some grade of retrograde amnesia may occur, although these are not required for diagnosis.Memory impairment must resolve within 24 hours.There should be no presence of focal neurological symptoms or deficits during or after attack.Cognitive impairment is limited to amnesia (no aphasia, apraxia, etc.).There must be no loss of personal identity.There must be no alteration of consciousness.There must be clear-cut presence of anterograde amnesia during attack.The episode must be witnessed by an observer who is present for most of the attack.The following witnessed criteria support the diagnosis (Caplan 1985 and Hodges and Warlow 1990): Some complex tasks are preserved, such as the ability to drive, but there is cognitive impairment with impaired ability to copy complex figures or to name objects. There is preservation of ideas and motor skills. The patient may not recognise acquaintances but does remember close relatives. There is complete or partial anterograde amnesia. The memory defect is recognised by the individual. A history of amnesia lasting less than one hour is suspicious of an epileptic disorder. There is no peripheral neurological deficit. Most episodes do not exceed 10 hours although up to 24 hours has been reported. The mean amnesia duration is ~ 6 hours although complete recovery of subtle functions may take months. In about 50 % (33 – 84%) of cases there is no precipitating factor identified. Typically, the disorder occurs following a physically demanding task (28 %), coitus (6.5%), emotional stress (6.5 %), hot or cold bath / shower (5 %), driving or a medical procedure. It is commoner in middle aged and older people. Watch closely for changes in your health, and be sure to contact your doctor or nurse advice line if you have any problems.This condition is a transient loss of memory. You begin to have trouble with familiar things, such as how to read or how to tell time.You notice changes in your behaviour or personality.You are more confused, forgetful, or upset than usual.You do not know who you are or where you are.Ĭall your doctor or nurse advice line now or seek immediate medical care if:.You develop a fever with a stiff neck or a severe headache.A sudden, severe headache that is different from past headaches.Sudden problems with walking or balance.Sudden confusion or trouble understanding simple statements.Sudden numbness, tingling, weakness, or loss of movement in your face, arm, or leg, especially on only one side of your body.TGA does not increase the chance that you will have a stroke or seizures in the future.Ĭall 911 anytime you think you may need emergency care. Although you may never be able to remember what happened right before or during the episode, the rest of your memory should come back. If your doctor did not find any of these things to be the cause of your memory loss, you will not need treatment and you can go back to your usual activities. Your doctor probably did an examination and ran some tests to rule out certain health problems that can also cause sudden memory loss, such as a stroke, brain tumour, seizure, head injury, or an infection. ![]() People who get migraines are more likely to have TGA. But, in some cases, an intense workout, sex, or stress may cause an episode. An episode usually does not last more than 6 hours and it rarely happens again. Unlike other types of amnesia, you do know who you are and you can recognize people that you know. You may ask the same question many times. ![]() You may also not know where you are, why you are there, or what the date is. When this happens you cannot remember events from your recent past or make new memories. Transient global amnesia (TGA) is a rare type of amnesia that causes sudden memory loss. ![]()
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