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Transient Global Amnesia: Risk Factors, Imaging Features, and Prognosis
Shunpo He1, Zhenzhen Ye1, Qingwei Yang2
1The Graduate School of Fujian Medical University, Fuzhou, People's Republic of China.
Neuropsychiatric Disease and Treatment
|June 3, 2021
Summary
Migraine may be a risk factor for transient global amnesia (TGA), a temporary memory loss condition. Lesions in the hippocampal CA1 region may be involved in TGA pathogenesis.
Area of Science:
- Neurology
- Neuroscience
- Medical Research
Background:
- Transient global amnesia (TGA) is a condition characterized by sudden, temporary anterograde memory loss.
- First described in 1956, the underlying mechanisms and specific brain lesions of TGA remain areas of investigation.
Purpose of the Study:
- To explore the potential mechanisms and responsible lesions associated with transient global amnesia (TGA).
- To identify risk factors and neurological correlates of TGA.
Main Methods:
- Retrospective analysis of 73 TGA patients and 73 matched controls admitted between 2011 and 2018.
- Collection of clinical data, medical history, and performance of functional magnetic resonance imaging (fMRI) to identify lesions.
Main Results:
- Migraine history was significantly more common in TGA patients (p=0.038).
- Seven TGA patients exhibited lesions in the hippocampal CA1 region, a key component of a memory loop.
- No significant differences in outcomes like cerebral infarction or recurrent TGA were observed during a 36-month follow-up.
Conclusions:
- Migraine is suggested as a potential risk factor for TGA.
- Cerebral infarction is proposed as a possible pathological mechanism.
- The memory loop involving the hippocampal CA1 region and fornix column is implicated in TGA.
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