Clinical Dementia Rating

Clinical Dementia Rating
Purposemeasures severity of symptoms of dementia

The Clinical Dementia Rating or CDR is a numeric scale used to quantify the severity of symptoms of dementia (i.e. its 'stage').

Scale

Using a structured-interview protocol developed by Charles Hughes,[1] Leonard Berg, John C. Morris and other colleagues at Washington University School of Medicine, a qualified health professional assesses a patient's cognitive and functional performance in six areas: memory, orientation, judgment & problem solving, community affairs, home & hobbies, and personal care. Scores in each of these are combined to obtain a composite score ranging from 0 through 3.[2] Clinical Dementia Rating Assignment Qualitative equivalences are as follows:NACC Clinical Dementia Rating

Composite Rating Symptoms
0 none
0.5 very mild
1 mild
2 moderate
3 severe

CDR is credited with being able to discern very mild impairments, but its weaknesses include the amount of time it takes to administer, its ultimate reliance on subjective assessment, and relative inability to capture changes over time.[3]

Validity

While the assessment is ultimately subjective in nature, recent studies have suggested a very high interrater reliability.[4] Thus the CDR is a reliable and valid tool for assessing and staging dementia.[5]

Importance

With increasing clinical focus on dementia, there is likewise increasing interest in pharmacology in the development of drugs to halt, or slow the progression of dementia-related illness such as Alzheimer's Disease. Therefore, early and accurate diagnosis of dementia and staging can be essential to proper clinical care. Without the ability to reliably assess dementia across the board, the misuse of anti-dementia compounds could have negative consequences, such as patients receiving the wrong medication, or not receiving treatment in the early stages of dementia when it is most needed.[6]

References

  1. ^ Br J Psychiatry. 1982 Jun;140:566-72. A new clinical scale for the staging of dementia. Hughes CP, Berg L, Danziger WL, Coben LA, Martin RL.
  2. ^ "Clinical Dementia Rating Assignment".
  3. ^ Utility of the Clinical Dementia Rating in Asian Populations - Lim et al. 5 (1): 61 - Clinical Medicine & Research
  4. ^ Rockwood, K.; Strang, D.; MacKnight, C.; Downer, R.; Morris, J. C. (2000). "Interrater reliability of the Clinical Dementia Rating in a multicenter trial". Journal of the American Geriatrics Society. 48 (5): 558–9. doi:10.1111/j.1532-5415.2000.tb05004.x. PMID 10811551. S2CID 31522657.
  5. ^ Nyunt, Ma Shwe Zin; Chong, Mei Sian; Lim, Wee Shiong; Lee, Tih Shih; Yap, Philip; Ng, Tze Pin (2013-10-29). "Reliability and Validity of the Clinical Dementia Rating for Community-Living Elderly Subjects without an Informant". Dementia and Geriatric Cognitive Disorders Extra. 3 (1): 407–416. doi:10.1159/000355122. ISSN 1664-5464. PMC 3843919. PMID 24348502.
  6. ^ Morris, J. C.; Ernesto, C.; Schafer, K.; Coats, M.; Leon, S.; Sano, M.; Thal, L. J.; Woodbury, P. (1997). "Clinical Dementia Rating training and reliability in multicenter studies". Neurology. 48 (6): 1508–1510. doi:10.1212/WNL.48.6.1508. PMID 9191756. S2CID 41691732.

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