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Long-Term Outcome in Patients With Transient Global Amnesia: A Population-Based Study
Julieta E Arena1, Robert D Brown1, Jay Mandrekar2
1Department of Neurology, Mayo Clinic, Rochester, MN.
Mayo Clinic Proceedings
|February 11, 2017
Summary
Transient global amnesia (TGA) does not increase the long-term risk of stroke, seizures, or cognitive decline. This study found no significant difference in these outcomes between TGA patients and controls.
Area of Science:
- Neurology
- Epidemiology
Background:
- Transient global amnesia (TGA) is a distinct neurological condition characterized by temporary memory loss.
- The long-term risks of cerebrovascular events, seizures, and cognitive impairment following TGA are not well-established.
Purpose of the Study:
- To investigate the long-term risk of cerebrovascular events, seizures, and cognitive impairment in patients diagnosed with TGA.
- To compare these risks between TGA patients and an age- and sex-matched control group.
Main Methods:
- A cohort of 221 patients diagnosed with possible TGA between 1985 and 2010 in Olmsted County, Minnesota, was identified.
- Data were analyzed using Kaplan-Meier survival plots and log-rank tests to compare outcomes between TGA patients and 221 matched controls over a mean follow-up of 12 years.
Main Results:
- No statistically significant differences were observed in the incidence of cerebrovascular events (stroke, TIA), seizures, or cognitive impairment (MCI, dementia) between the TGA group and the control group.
- Migraine history was more prevalent in the TGA group (19.1% vs 5.4%). TGA recurrence occurred in 5.4% of patients.
- Mortality and functional outcomes (modified Rankin scale) were similar in both groups.
Conclusions:
- An episode of TGA does not appear to elevate the risk of subsequent cerebrovascular events, seizures, or cognitive impairment.
- The findings suggest TGA is not a significant predictor of long-term neurological sequelae.
- Further research may explore the underlying mechanisms differentiating TGA from other transient neurological events.
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