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Published in: Journal of Neurology 2/2016

Open Access 01-02-2016 | Original Communication

Domain-specific versus generalized cognitive screening in acute stroke

Authors: Nele Demeyere, M. J. Riddoch, E. D. Slavkova, K. Jones, I. Reckless, P. Mathieson, G. W. Humphreys

Published in: Journal of Neurology | Issue 2/2016

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Abstract

Cognitive assessments after stroke are typically short form tests developed for dementia that generates pass/fail classifications (e.g. the MoCA). The Oxford Cognitive Screen (OCS) provides a domain-specific cognitive profile designed for stroke survivors. This study compared the use of the MoCA and the OCS in acute stroke with respect to symptom specificity and aspects of clinical utility. A cross-sectional study with a consecutive sample of 200 stroke patients within 3 weeks of stroke completing MoCA and OCS. Demographic data, lesion side and Barthel scores were recorded. Inclusivity was assessed in terms of completion rates and reasons for non-completion were evaluated. The incidence of cognitive impairments on both the MoCA and OCS sub-domains was calculated and differences in stroke specificity, cognitive profiles and independence of the measures were addressed. The incidence of acute cognitive impairment was high: 76 % of patients were impaired on MoCA, and 86 % demonstrated at least one impairment on the cognitive domains assessed in the OCS. OCS was more sensitive than MoCA overall (87 vs 78 % sensitivity) and OCS alone provided domain-specific information on prevalent post-stroke cognitive impairments (neglect, apraxia and reading/writing ability). Unlike the MOCA, the OCS was not dominated by left hemisphere impairments but gave differentiated profiles across the contrasting domains. The OCS detects important cognitive deficits after stroke not assessed in the MoCA, it is inclusive for patients with aphasia and neglect and it is less confounded by co-occurring difficulties in these domains.
Footnotes
1
Note that there is a long known link between aphasia and apraxia [26]; our findings concur with previous findings that most patients who demonstrate praxis problems will also have a dysphasia, though not necessarily the other way around.
 
2
We note that a ‘standard of truth’ does not exist for assessments of cognition. Here, we simply assess the sensitivity of the OCS relative to a current gold standard of clinical practice, the MOCA.
 
3
Although MoCA sentence repetition does not have task-specific cut offs, we defined failing the task if the participant made errors on at least one of the two sentence repetitions.
 
4
Fluency tasks are often used as part of assessment of organisational strategy within executive functioning (e.g. in DKEFS [29] see also the Addenbrooke’s Cognitive Examination [30].
 
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Metadata
Title
Domain-specific versus generalized cognitive screening in acute stroke
Authors
Nele Demeyere
M. J. Riddoch
E. D. Slavkova
K. Jones
I. Reckless
P. Mathieson
G. W. Humphreys
Publication date
01-02-2016
Publisher
Springer Berlin Heidelberg
Published in
Journal of Neurology / Issue 2/2016
Print ISSN: 0340-5354
Electronic ISSN: 1432-1459
DOI
https://doi.org/10.1007/s00415-015-7964-4

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