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Detecting delirium superimposed on dementia: diagnostic accuracy of a simple combined arousal and attention testing procedure

Lookup NU author(s): Dr Sarah Richardson

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).


Abstract

Copyright © International Psychogeriatric Association 2017 Background:: Detecting delirium superimposed on dementia (DSD) can be challenging because assessment partly relies on cognitive tests that may be abnormal in both conditions. We hypothesized that a combined arousal and attention testing procedure would accurately detect DSD. Methods:: Patients aged ≥70 years were recruited from five hospitals across Europe. Delirium was diagnosed by physicians using DSM-5 criteria using information from nurses, carers, and medical records. Dementia was ascertained by the Informant Questionnaire on Cognitive Decline in the Elderly. Arousal was measured using the Observational Scale of Level of Arousal (OSLA), which assesses eye opening, eye contact, posture, movement, and communication. Attention was measured by participants signaling each time an “A” was heard when “S-A-V-E-A-H-A-A-R-T” was read out. Results:: The sample included 114 persons (mean age 82 years (SD 7); 54% women). Dementia alone was present in 25% (n = 28), delirium alone in 18% (n = 21), DSD in 27% (n = 31), and neither in 30% (n = 34). Arousal and attention was assessed in n = 109 (96%). Using OSLA, 83% participants were correctly identified as having delirium (sensitivity 85%, specificity 82%, AUROC 0.92). The attention task correctly classified 76% of participants with delirium (sensitivity 90%, specificity 64%, AUROC 0.80). Combining scores correctly classified 91% of participants with delirium (sensitivity 84%, specificity 92%, AUROC 0.94). Diagnostic accuracy remained high in the subgroup with dementia (93% correctly classified, sensitivity 94%, specificity 92%, AUROC 0.98). Conclusions:: This combined arousal–attention assessment to detect DSD was brief yet had high diagnostic accuracy. Such an approach could have clinical utility for diagnosing DSD.


Publication metadata

Author(s): Richardson SJ, Davis DHJ, Bellelli G, Hasemann W, Meagher D, Kreisel SH, MacLullich AMJ, Cerejeira J, Morandi A

Publication type: Article

Publication status: Published

Journal: International Psychogeriatrics

Year: 2017

Volume: 29

Issue: 10

Pages: 1585-1593

Print publication date: 01/10/2017

Online publication date: 31/05/2017

Acceptance date: 02/04/2017

Date deposited: 07/08/2017

ISSN (print): 1041-6102

ISSN (electronic): 1741-203X

Publisher: Cambridge University Press

URL: https://doi.org/10.1017/S1041610217000916

DOI: 10.1017/S1041610217000916


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