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Small baseline volume of left hippocampus is associated with subsequent conversion of MCI into dementia: the Göteborg
C Eckerström1, E Olsson, M Borga
1Institute of Neuroscience and Physiology, Göteborg University, Sweden.
Background:
Earlier studies have reported that hippocampal atrophy can to some extent predict which patients with mild cognitive impairment (MCI) will subsequently convert to dementia, and that converters have an enhanced rate of hippocampal volume loss.
Objective:
To further validate the hypothesis that hippocampal atrophy predicts conversion from MCI to dementia, to relate baseline hippocampal volume to different forms of dementia, and to investigate the role of hippocampal side differences and rate of volume loss over time.
Patients:
The subjects (N=68) include patients with MCI at baseline and progression to dementia at the two-year follow-up (N=21), stable MCI patients (N=21), and controls (N=26). Among the progressing patients, 13 were diagnosed as having AD.
Methods:
The Göteborg MCI study is a clinically based longitudinal study with biannual clinical assessments. Hippocampal volumetry was performed manually on the MRI investigations at baseline and at the two-year follow-up.
Results:
Hippocampal volumetry could predict conversion to dementia in both the AD and the non-AD subgroup of converters. Left hippocampal volume in particular discriminated between converting and stable MCI. Cut off points for individual discrimination were shown to be potentially useful. The converting MCI group had a significantly higher rate of hippocampal volume loss as compared to the stable MCI group.
Conclusions:
In MCI patients, hippocampal volumetry at baseline gives prognostic information about possible development of AD and non-AD dementia. Contrary to earlier studies, we found that left hippocampal volume has the best predictive power. Reliable predictions appear to be possible in many individual cases.
Insights
Hippocampal atrophy predicts dementia conversion in mild cognitive impairment (MCI) patients. Left hippocampal volume is a key predictor, with faster volume loss indicating higher conversion risk.
Area of Science:
- Neurology
- Neuroimaging
- Cognitive Science
Background:
- Hippocampal atrophy is linked to mild cognitive impairment (MCI) progression to dementia.
- Previous research suggests converters show accelerated hippocampal volume loss.
Purpose of the Study:
- Validate hippocampal atrophy as a predictor of MCI to dementia conversion.
- Correlate baseline hippocampal volume with dementia subtypes.
- Examine the influence of hippocampal asymmetry and volume change rate.
Main Methods:
- Longitudinal study of 68 participants (MCI converters, stable MCI, controls).
- Manual hippocampal volumetry performed on MRI scans at baseline and 2-year follow-up.
- Clinical assessments conducted biannually.
Main Results:
- Hippocampal volumetry accurately predicted dementia conversion in MCI patients.
- Left hippocampal volume was the strongest discriminator between converters and stable MCI.
- Converting MCI patients exhibited significantly greater hippocampal volume loss than stable MCI patients.
Conclusions:
- Baseline hippocampal volumetry provides prognostic value for dementia development in MCI.
- Left hippocampal volume demonstrated superior predictive power for conversion.
- Individual prediction of dementia risk appears feasible in a significant number of cases.
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