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Forgetting in dementia with and without subcortical lacunes
Joel H Kramer1, Dan Mungas, Bruce R Reed
1San Francisco Medical Center, University of California, CA 94143, USA. kramer@itsa.ucsf.edu
The Clinical Neuropsychologist
|December 15, 2004
Summary
Alzheimer's disease (AD) patients forget information faster than subcortical ischemic vascular disease (SIVD) patients. Rapid forgetting in SIVD may indicate co-occurring AD, while good retention suggests purely vascular dementia.
Area of Science:
- Neurology
- Neuroscience
- Gerontology
Background:
- Alzheimer's disease (AD) and subcortical ischemic vascular disease (SIVD) are leading causes of dementia.
- Differentiating between AD and SIVD is clinically challenging due to overlapping symptoms.
- Co-occurrence of AD and SIVD is common, complicating diagnosis.
Purpose of the Study:
- To investigate memory retention differences between AD and SIVD patients.
- To test the hypothesis that SIVD patients exhibit better information retention than AD patients.
- To explore the relationship between memory patterns and underlying pathology in SIVD.
Main Methods:
- Comparative study involving three groups: SIVD patients, AD patients, and normal controls.
- Assessment of initial information acquisition and subsequent forgetting rates.
- Analysis of memory patterns and correlation with executive functions and autopsy findings.
Main Results:
- AD patients demonstrated significantly more rapid forgetting compared to SIVD patients, despite similar initial learning.
- Memory retention in SIVD patients was heterogeneous: some showed rapid forgetting, others good retention.
- SIVD patients with good retention tended to have greater executive impairments than those with rapid forgetting or AD patients.
Conclusions:
- Rapid forgetting in SIVD patients may suggest the presence of concomitant Alzheimer's disease.
- Good memory retention in SIVD patients could indicate dementia of purely vascular origin.
- Autopsy results in a subset of SIVD patients with rapid forgetting confirmed Alzheimer's pathology, supporting the diagnostic utility of memory patterns.