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Computed tomography findings in senile dementia and normal aging
Journal of Neurology, Neurosurgery, and Psychiatry
|January 1, 1982
Summary
Computed tomography (CT) scans reveal distinct brain changes in Alzheimer-type dementia (SDAT) and multi-infarct dementia. SDAT patients show greater ventricular enlargement compared to controls and multi-infarct dementia patients.
Area of Science:
- Neurology
- Radiology
- Gerontology
Background:
- Senile dementia of Alzheimer type (SDAT) and multi-infarct dementia are common causes of cognitive decline in the elderly.
- Distinguishing between these dementia types using neuroimaging is crucial for appropriate management.
- Computed tomography (CT) offers a non-invasive method to assess brain structural changes.
Purpose of the Study:
- To compare CT findings in patients with SDAT, multi-infarct dementia, and age-matched healthy controls.
- To identify specific CT biomarkers that differentiate SDAT from multi-infarct dementia.
- To investigate the relationship between cognitive impairment severity and CT-measured brain atrophy and ventricular size.
Main Methods:
- Retrospective analysis of CT scans from 57 SDAT patients, 19 multi-infarct dementia patients, and 85 controls.
- Quantitative assessment of ventricular size (ventricular dilatation, frontal horn index, cella media index, third ventricle width) and cortical atrophy.
- Correlation of CT findings with cognitive test scores and clinical diagnosis.
Main Results:
- SDAT patients exhibited significantly greater ventricular dilatation and cortical atrophy than controls, even in mild cases.
- Ventricular dilatation in SDAT correlated with intellectual impairment severity, but cortical atrophy did not correlate with cognitive scores.
- Multi-infarct dementia patients showed differences from controls in all CT variables, including local changes.
- SDAT patients had more pronounced ventricular dilatation than multi-infarct dementia patients.
- Multi-infarct dementia patients demonstrated more frequent focal lesions compared to SDAT patients.
Conclusions:
- CT can differentiate SDAT from multi-infarct dementia based on patterns of ventricular enlargement and focal changes.
- Increased ventricular dilatation is a prominent feature of SDAT, worsening with cognitive decline.
- Focal lesions are more characteristic of multi-infarct dementia than SDAT.