Transient global amneisa differential diagnosis
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Overview
Transient global amnesia (TGA) is diagnosed clinically and must be distinguished from other causes of sudden memory loss. The diagnosis becomes doubtful when features deviate from the typical pattern.[1]
Features Typical of Transient Global Amnesia[2]
- Sudden onset of clear anterograde amnesia.
- Repetitive, stereotyped questioning.
- Preservation of alertness and personal identity.
- No clouding of consciousness.
- No focal neurologic signs during or after the episode.
- Resolution within 24 hours, leaving a memory gap for the episode.
The following findings are not typical of transient global amnesia and suggest another cause:
- Clouding of consciousness or delirium[2].
- Inattention or incoherence[2].
- Aphasia, paresthesias, vertigo, ataxia, or other focal neurologic deficits[2].
- Cognitive deficits beyond memory detected on bedside testing[2].
- Loss of personal identity (more typical of functional or psychogenic amnesia)[2].
- Epileptic features[2].
- Recent head injury[2].
Transient global amneisa differential diagnosis
Transient Epileptic Amnesia[3]
- Often of short duration (15–30 minutes).
- May occur in repeated episodes separated by weeks.
- May include olfactory hallucinations, tearfulness, or unusual memory disturbances.
- Frequently lacks the classic repetitive stereotyped questioning seen in TGA.
- Patients are generally younger than those with typical TGA.
Stroke or Isolated Hippocampal Infarction
- Rare cases of isolated hippocampal infarction may initially resemble TGA[4][5].
- The key difference is that the memory deficit does not resolve[4][5].
- Some ischemic syndromes may include repetitive questioning, but the pattern is not typically as stereotyped or frequent as in TGA[6].
Concussive Amnesia[6]
- May closely resemble TGA, including repetitive questioning.
- Occurs in the setting of head trauma, distinguishing it from TGA.
Migraine-Related Amnesia
- Transient amnesia during or preceding migraine has been described but is rare[7].
- In children, it may appear as part of a migrainous confusional state[8].
Electroconvulsive Therapy (ECT)
- Electroconvulsive therapy produces memory loss for the period of the procedure and for some time before and after.
- This pattern can simulate TGA, but the cause is obvious and procedure-related, and therefore clearly distinguishable from spontaneous TGA.
References
- ↑ 1.0 1.1 Werner R, Woehrle JC (2021). "Prevalence of Mimics and Severe Comorbidity in Patients with Clinically Suspected Transient Global Amnesia". Cerebrovasc Dis. 50 (2): 171–177. doi:10.1159/000512602. PMID 33412553 Check
|pmid=value (help). - ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Hodges JR, Warlow CP (October 1990). "Syndromes of transient amnesia: towards a classification. A study of 153 cases". J Neurol Neurosurg Psychiatry. 53 (10): 834–43. doi:10.1136/jnnp.53.10.834. PMC 488242. PMID 2266362.
- ↑ Baker J, Savage S, Milton F, Butler C, Kapur N, Hodges J, Zeman A (2021). "The syndrome of transient epileptic amnesia: a combined series of 115 cases and literature review". Brain Commun. 3 (2): fcab038. doi:10.1093/braincomms/fcab038. PMC 8047097 Check
|pmc=value (help). PMID 33884371 Check|pmid=value (help). - ↑ 4.0 4.1 Kirshner HS (December 2011). "Transient global amnesia: a brief review and update". Curr Neurol Neurosci Rep. 11 (6): 578–82. doi:10.1007/s11910-011-0224-9. PMID 21894575.
- ↑ 5.0 5.1 Adler AC, Warum D, Sapire JM (2012). "Transient global amnesia caused by hippocampal infarct: case report and review of literature". Clin Imaging. 36 (5): 584–6. doi:10.1016/j.clinimag.2011.11.022. PMID 22920366.
- ↑ 6.0 6.1 BENDER MB (March 1960). "Single episode of confusion with amnesia". Bull N Y Acad Med. 36 (3): 197–207. PMC 1806291. PMID 13798787.
- ↑ Caplan L, Chedru F, Lhermitte F, Mayman C (September 1981). "Transient global amnesia and migraine". Neurology. 31 (9): 1167–70. doi:10.1212/wnl.31.9.1167. PMID 7196542.
- ↑ Sheth RD, Riggs JE, Bodensteiner JB (February 1995). "Acute confusional migraine: variant of transient global amnesia". Pediatr Neurol. 12 (2): 129–31. doi:10.1016/0887-8994(94)00154-t. PMID 7779209.