Screening for dementia and investigating its causes.

Abstract:

OBJECTIVE:To examine, from the perspective of primary care physicians, the value of mental status findings and ancillary tests in diagnosing dementia or its causes. DATA SOURCES:Studies identified using MEDLINE and bibliographies of pertinent articles. STUDY SELECTION:Selection based on availability of information on specific findings or tests, the criterion standard used to confirm diagnoses, the disease spectrum, and the richness of the reported data. DATA EXTRACTION:Data collected on sensitivity and specificity. In many cases, the originally reported data are re-analyzed to illustrate the usefulness of alternative cut-off values or to answer specific clinical questions. Likelihood ratios estimated to summarize test results. DATA SYNTHESIS:Probability of dementia is greatly reduced (likelihood ratio, 0.06 to 0.2) when either normal serial 7s, 7-digit span, 3-item recall, or clock drawing test results are obtained; abnormal results only moderately increase the odds of disease. Low (less than or equal to 20), intermediate (21 to 25), or high (greater than or equal to 26) scores on the Mini-Mental State Examination (MMSE) increase (likelihood ratio greater than or equal to 8.2), have little effect (likelihood ratio, 1.3 to 2.4), or decrease (likelihood ratio, 0.06 to 0.1) the odds of disease. The usefulness of tests to investigate the cause of dementia varies depending on the pretest probability of the specific condition. CONCLUSIONS:Several useful methods exist to screen for cognitive impairment, and clinicians need to be familiar with the strengths and limitations of their preferred screening methods. In investigating the cause of dementia, routinely obtaining a VDRL test, cerebral imaging studies, serum cobalamin level, or folate level is unwarranted.

journal_name

Ann Intern Med

authors

Siu AL

doi

10.7326/0003-4819-115-2-122

subject

Has Abstract

pub_date

1991-07-15 00:00:00

pages

122-32

issue

2

eissn

0003-4819

issn

1539-3704

journal_volume

115

pub_type

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