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Neuropathologically confirmed Alzheimer's disease: clinical diagnoses in 394 cases
M F Mendez1, A R Mastri, J H Sung
1Department of Neurology, St Paul-Ramsey Medical Center, MN 55101.
Abstract:
In the absence of pathognomonic clinical features, the clinical diagnosis of Alzheimer's disease (AD) remains one of exclusion of other dementias. We investigated the clinical diagnoses among 394 neuropathologically confirmed AD cases in a dementia brain bank. Most patients were correctly diagnosed as AD (348 or 88%). Among the misdiagnosed patients, AD was mistaken for a primary depressive disorder in 14, multi-infarct dementia in 13, Parkinson's disease in nine, and alcoholic dementia in four. The number of misdiagnosed AD patients did not differ between physician specialties but was greater among AD patients with agitation, depression, paranoia, or delusions. This retrospective study suggests that the diagnostic sensitivity for AD is high among a cross-section of practicing physicians and that an important factor in mistaking AD for another illness is unfamiliarity with the potential psychiatric symptoms of AD.
Insights
Accurate Alzheimer's disease (AD) diagnosis is challenging. This study found most AD cases were correctly diagnosed, but psychiatric symptoms like agitation and paranoia increased misdiagnosis rates, often mistaken for depression.
Area of Science:
- Neurology
- Geriatrics
- Psychiatry
Background:
- Clinical diagnosis of Alzheimer's disease (AD) relies on excluding other dementias due to a lack of pathognomonic features.
- Accurate diagnosis is crucial for timely intervention and management of AD.
- Neuropathological confirmation remains the gold standard for AD diagnosis.
Purpose of the Study:
- To evaluate the accuracy of clinical diagnoses of Alzheimer's disease (AD) in a large cohort.
- To identify factors contributing to misdiagnosis of AD.
- To assess the impact of psychiatric symptoms on AD diagnostic accuracy.
Main Methods:
- Retrospective analysis of 394 neuropathologically confirmed Alzheimer's disease (AD) cases from a dementia brain bank.
- Review of clinical diagnostic records and comparison with post-mortem neuropathological findings.
- Statistical analysis to identify correlations between clinical presentation and diagnostic accuracy.
Main Results:
- 88% (348/394) of patients with neuropathologically confirmed Alzheimer's disease (AD) received a correct clinical diagnosis.
- Common misdiagnoses included primary depressive disorder, multi-infarct dementia, Parkinson's disease, and alcoholic dementia.
- Misdiagnosis rates were higher in patients exhibiting agitation, depression, paranoia, or delusions, irrespective of physician specialty.
Conclusions:
- The diagnostic sensitivity for Alzheimer's disease (AD) is generally high among practicing physicians.
- Unfamiliarity with the psychiatric manifestations of AD is a significant factor in diagnostic errors.
- Increased awareness and recognition of AD's psychiatric symptoms are essential for improving diagnostic accuracy.