A comparison of clinical methods for assessing dementia

Area of Science:

• Gerontology
• Neurology
• Psychiatry

Background:

• Physicians use diverse methods for dementia assessment, including the Mental State Questionnaire (MSQ), Face-Hand Test (FHT), and Dementia Rating Scale (DRS).
• Evaluating the concurrence of these methods is crucial for accurate cognitive impairment screening and staging in the elderly.

Purpose of the Study:

• To assess the agreement between various clinical methods used for dementia evaluation in community-dwelling elderly individuals.
• To determine the relationship between cognitive impairment and other health factors like physical health, drug use, and mood.

Main Methods:

• A sample of elderly persons was evaluated using eight indices, including MSQ, FHT, DRS, developmental reflexes, focal neurologic signs, and assessments for depression, stroke, and physical health.
• Subjects were retested after one year to evaluate the predictive validity of the MSQ and DRS.

Main Results:

• The DRS and FHT showed 76% and 45% concurrence with MSQ-based impairment classification, respectively.
• Positive focal signs and developmental reflexes were linked to cognitive impairment but were infrequent. Physical health, drug use, and demographics did not correlate with cognitive function.
• Dysphoric mood correlated with cognitive impairment, but pseudodementia was not observed. A significant portion of subjects showed improvement upon retesting, indicating poor predictive validity.

Conclusions:

• Clinical methods for screening and staging cognitive impairment have variable utility and limited predictive validity.
• Recommendations are made for a standardized battery of tests to improve the assessment of cognitive function in the elderly.