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The structural connectivity of the recurrent transient global amnesia
Y Moon1, W-J Moon2, S-H Han1,3
1Department of Neurology, Konkuk University Medical Center, Seoul, Korea.
Acta Neurologica Scandinavica
|October 16, 2015
Summary
Recurrent transient global amnesia (TGA) attacks do not show weakened memory network connectivity. Structural brain imaging revealed no disruptions in patients with repeated TGA episodes compared to single-episode cases.
Area of Science:
- Neuroscience
- Neurology
- Medical Imaging
Background:
- Transient global amnesia (TGA) pathophysiology is debated.
- A recent hypothesis suggests pre-existing memory network vulnerability in TGA patients.
Purpose of the Study:
- To test if recurrent TGA patients have more disrupted structural connectivity than single-episode TGA patients.
- To compare brain imaging of TGA patients with recurrent versus single episodes.
Main Methods:
- Diffusion tensor imaging (DTI) was used.
- Tract-based spatial statistics (TBSS) analyzed DTI data.
- Seven recurrent TGA patients and 14 single-episode TGA controls were studied.
Main Results:
- No significant reduction in fractional anisotropy or mean diffusivity was found in the memory pathway of recurrent TGA patients compared to single-episode patients.
- Structural connectivity within the memory pathway remained intact in both groups.
Conclusions:
- The hypothesis of predisposing memory network weakness in recurrent TGA is refuted.
- Recurrent TGA attacks do not appear to cause lasting microstructural damage to the memory pathway.
- The stability of structural connectivity suggests resilience despite repeated TGA events.
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