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Longitudinal diagnosis of memory disorders.
D O'Neill1, D J Surmon, G K Wilcock
1Department of Care of the Elderly, Frenchay Hospital, Bristol.
Age and Ageing
|November 1, 1992
Summary
Diagnosing dementia requires multiple visits, not just one assessment. Serial evaluations are crucial for accurate diagnosis and tracking disease progression in memory disorder patients.
Area of Science:
- Neurology
- Geriatrics
- Psychiatry
Background:
- Early referral for memory disorders and dementia is increasing.
- The mean Mini-Mental State Examination (MMSE) score for new patients has risen.
- Diagnosing mild to moderate dementia presents clinical challenges.
Purpose of the Study:
- To determine the number of visits needed for dementia diagnosis.
- To assess the stability of dementia diagnoses.
- To evaluate the role of the MMSE in diagnosis duration.
Main Methods:
- Analysis of 125 patients at a Memory Disorders Clinic with at least two visits.
- Assessment of diagnostic stability over time.
- Correlation of MMSE scores with diagnostic timelines.
Main Results:
- Nearly half of patients required two or more visits for diagnosis.
- MMSE scores did not predict the number of visits needed.
- Diagnoses were stable for patients scoring 10/30 or less.
- 16% of patients had diagnoses change between Alzheimer's, mixed, and vascular dementia categories.
- Age-associated memory impairment progressed to dementia in 6/8 cases.
- Depression progressed to dementia in 3/3 cases.
Conclusions:
- Diagnosing mild to moderate dementia requires serial assessments, not just a cross-sectional approach.
- Longitudinal clinical, psychological, and affective evaluations are essential.
- Diagnosis stability varies, with some patients showing diagnostic interchangeability.