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Cognitive test performance in detecting, staging, and tracking Alzheimer's disease
J J Locascio1, J H Growdon, S Corkin
1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, USA.
Archives of Neurology
|November 1, 1995
Summary
Alzheimer's disease (AD) impairs cognitive functions. Specific tests effectively detect AD, stage dementia severity, and track progression, with naming and fluency tests best for staging.
Area of Science:
- Neurology
- Cognitive Science
- Gerontology
Background:
- Alzheimer's disease (AD) is a progressive neurodegenerative disorder.
- Early and accurate diagnosis is crucial for patient management and therapeutic interventions.
Purpose of the Study:
- To identify specific cognitive deficits in Alzheimer's disease (AD).
- To determine the optimal cognitive tests for detecting AD, staging dementia severity, and tracking disease progression.
Main Methods:
- 123 patients with AD and 60 healthy controls were assessed.
- Ten cognitive tests measuring memory, language, visuospatial abilities, and reasoning were administered.
- Participants were followed for up to 5.5 years with repeated testing.
Main Results:
- Patients with AD performed significantly worse than controls on all cognitive tests.
- Delayed recall tests were effective for early AD detection but poor for staging.
- Confrontation naming, semantic fluency, and immediate geometric figure recognition showed linear decline and were best for staging dementia severity.
Conclusions:
- Impaired delayed recall in AD is linked to early cholinergic and hippocampal pathology.
- Progressive decline in language and visuospatial abilities suggests widespread neocortical neuron loss.
- Cognitive test selection is critical for accurate AD diagnosis, staging, and monitoring.