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White matter microstructure and apathy level in amnestic mild cognitive impairment
Claudia Cacciari1, Marta Moraschi, Margherita Di Paola
1IRCCS Santa Lucia Foundation, Rome, Italy.
Journal of Alzheimer'S Disease : JAD
|February 19, 2010
Summary
Apathy in mild cognitive impairment is linked to white matter damage. Diffusion tensor imaging revealed microstructural deficits in specific brain regions, suggesting early neural changes in dementia.
Area of Science:
- Neuroimaging
- Neurology
- Cognitive Science
Background:
- Apathy is a common symptom in amnestic mild cognitive impairment (aMCI).
- Understanding the neural underpinnings of apathy in aMCI is crucial for early diagnosis and intervention.
- White matter integrity may be affected in the early stages of cognitive decline.
Purpose of the Study:
- To investigate the relationship between white matter microstructural deficits and apathy levels in patients with aMCI.
- To identify specific white matter tracts associated with apathy using diffusion tensor imaging (DTI).
Main Methods:
- Diffusion tensor imaging (DTI) was performed on 20 patients with aMCI.
- Mean diffusivity (MD) and fractional anisotropy (FA) were analyzed.
- Correlations between DTI metrics and apathy scores were examined.
Main Results:
- Positive correlations were found between mean diffusivity and apathy levels in several right-hemisphere white matter tracts, including the uncinate, middle and inferior longitudinal fasciculi, parathalamic white matter, fornix, and posterior cingulum.
- Fractional anisotropy results indicated white matter disconnection associated with apathy in most examined areas, excluding the middle longitudinal fasciculus.
Conclusions:
- White matter microstructural deficits are associated with apathy in patients with amnestic mild cognitive impairment.
- These findings suggest that neural alterations related to apathy occur early in the progression of degenerative dementias.
- DTI may serve as a valuable tool for detecting early neurobiological changes linked to apathy in cognitive impairment.
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