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    Hospitalisation without delirium is not associated with cognitive decline in a population-based sample of older people-results from a nested, longitudinal cohort study

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    Author
    Stephan, Blossom C. M.
    Keyword
    Delirium
    Hospitalisation
    Cognition
    Date
    2021
    
    Metadata
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    DOI
    10.1093/ageing/afab068
    Publisher's URL
    https://academic.oup.com/ageing/advance-article/doi/10.1093/ageing/afab068/6261384
    Abstract
    BACKGROUNDAcute hospitalisation and delirium have individually been shown to adversely affect trajectories of cognitive decline but have not previously been considered together. This work aimed to explore the impact on cognition of hospital admission with and without delirium, compared to a control group with no hospital admissions.METHODSThe Delirium and Cognitive Impact in Dementia (DECIDE) study was nested within the Cognitive Function and Ageing Study II (CFAS II)-Newcastle cohort. CFAS II participants completed two baseline interviews, including the Mini-Mental State Examination (MMSE). During 2016, surviving participants from CFAS II-Newcastle were recruited to DECIDE on admission to hospital. Participants were reviewed daily to determine delirium status.During 2017, all DECIDE participants and age, sex and years of education matched controls without hospital admissions during 2016 were invited to repeat the CFAS II interview. Delirium was excluded in the control group using the Informant Assessment of Geriatric Delirium Scale (i-AGeD). Linear mixed effects modelling determined predictors of cognitive decline.RESULTSDuring 2016, 82 of 205 (40%) DECIDE participants had at least one episode of delirium. At 1 year, 135 of 205 hospitalised participants completed an interview along with 100 controls. No controls experienced delirium (i-AGeD>4). Delirium was associated with a faster rate of cognitive decline compared to those without delirium (β = -2.2, P < 0.001), but number of hospital admissions was not (P = 0.447).CONCLUSIONSThese results suggest that delirium during hospitalisation rather than hospitalisation per se is a risk factor for future cognitive decline, emphasising the need for dementia prevention studies that focus on delirium intervention.
    Citation
    Richardson, S. J., Lawson, R., Davis, D. H. J., Stephan, B. C. M., Robinson, L., Matthews, F. E., Brayne, C., Barnes, L. E., Taylor, J.-P., Parker, S. G., et al. (2021). Hospitalisation without delirium is not associated with cognitive decline in a population-based sample of older people-results from a nested, longitudinal cohort study. Age and Ageing, 50(5), pp. 1675-1681.
    URI
    http://hdl.handle.net/20.500.12904/14699
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