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Bedside cognitive screening instruments. A critical assessment.

A Nelson, B S Fogel, D Faust

The Journal of Nervous and Mental Disease

|February 1, 1986

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Bedside cognitive screening tests aid in detecting cognitive impairment but do not improve diagnostic accuracy over clinical exams alone. These tools have limitations, including false-negative rates and potential bias, necessitating further research for improved clinical utility.

Area of Science:

Neurology
Psychiatry
Gerontology

Background:

Bedside cognitive screening instruments are increasingly utilized in clinical practice and research.
These tools aim to detect cognitive impairment and quantify its severity.

Purpose of the Study:

To review the five most frequently cited bedside cognitive screening tests.
To evaluate their reliability, diagnostic correspondence, and limitations.

Main Methods:

Review of five prominent interview-format, brief bedside cognitive screening tests: Mini-Mental State Examination, Cognitive Capacity Screening Examination, Mattis Dementia Rating Scale, Kahn's Mental Status Questionnaire, and Short Portable Mental Status Questionnaire.
Assessment of inter-rater and test-retest reliability.
Comparison with clinical diagnoses of delirium and dementia.

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Main Results:

All reviewed tests demonstrate adequate inter-rater reliability; three have adequate test-retest reliability.
Tests correlate well with clinical diagnoses of delirium and dementia, proving useful for quantification.
No evidence suggests these tests enhance diagnostic accuracy beyond clinical examination alone.
Substantial false-negative rates exist, particularly in patients with right-hemisphere focal lesions.
False-positive errors may be more prevalent in individuals with lower education and socioeconomic status.
The reviewed tests fail to detect certain cognitive deficits crucial for differential diagnosis and management.

Conclusions:

While valuable for initial screening and quantification, current bedside cognitive tests do not surpass clinical examination in diagnostic accuracy.
Limitations such as false-negative rates and potential biases necessitate caution in their interpretation.
Further research is recommended to refine existing measures and develop new screening tools for broader clinical applicability.