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Al-Harrasi AM, Iqbal E, Tsamakis K, Lasek J, Gadelrab R, Soysal P, Kohlhoff E, Tsiptsios D, Rizos E, Perera G, Aarsland D, Stewart R, Mueller C. Motor signs in Alzheimer's disease and vascular dementia: Detection through natural language processing, co-morbid features and relationship to adverse outcomes. Exp Gerontol 2021; 146:111223. [PMID: 33450346 DOI: 10.1016/j.exger.2020.111223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 11/09/2020] [Accepted: 12/21/2020] [Indexed: 11/21/2022]
Abstract
BACKGROUND Motor signs in patients with dementia are associated with a higher risk of cognitive decline, institutionalisation, death and increased health care costs, but prevalences differ between studies. The aims of this study were to employ a natural language processing pipeline to detect motor signs in a patient cohort in routine care; to explore which other difficulties occur co-morbid to motor signs; and whether these, as a group and individually, predict adverse outcomes. METHODS A cohort of 11,106 patients with dementia in Alzheimer's disease, vascular dementia or a combination was assembled from a large dementia care health records database in Southeast London. A natural language processing algorithm was devised in order to establish the presence of motor signs (bradykinesia, Parkinsonian gait, rigidity, tremor) recorded around the time of dementia diagnosis. We examined the co-morbidity profile of patients with these symptoms and used Cox regression models to analyse associations with survival and hospitalisation, adjusting for twenty-four potential confounders. RESULTS Less than 10% of patients were recorded to display any motor sign, and tremor was most frequently detected. Presence of motor signs was associated with younger age at diagnosis, neuropsychiatric symptoms, poor physical health and higher prescribing of psychotropics. Rigidity was independently associated with a 23% increased mortality risk after adjustment for confounders (p = 0.014). A non-significant trend for a 15% higher risk of hospitalisation was detected in those with a recorded Parkinsonian gait (p = 0.094). CONCLUSIONS With the exception of tremor, motor signs appear to be under-recorded in routine care. They are part of a complex clinical picture and often accompanied by neuropsychiatric and functional difficulties, and thereby associated with adverse outcomes. This underlines the need to establish structured examinations in routine clinical practice via easy-to-use tools.
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Affiliation(s)
- Ahmed M Al-Harrasi
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK; Sultan Qaboos University Hospital, Muscat, Oman
| | - Ehtesham Iqbal
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Konstantinos Tsamakis
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK; National and Kapodistrian University of Athens, School of Medicine, Second Department of Psychiatry, University General Hospital 'ATTIKON', Athens, Greece
| | - Judista Lasek
- South London and Maudsley NHS Foundation Trust, London, UK
| | | | - Pinar Soysal
- Department of Geriatric Medicine, Faculty of Medicine, Bezmialem Vakif University, Istanbul, Turkey
| | - Enno Kohlhoff
- Aragon Institute for Health Research (IIS Aragón), Zaragoza, Spain
| | - Dimitrios Tsiptsios
- Neurophysiology Department, Sunderland Royal Hospital, South Tyneside & Sunderland NHS Foundation Trust, Sunderland, UK
| | - Emmanouil Rizos
- National and Kapodistrian University of Athens, School of Medicine, Second Department of Psychiatry, University General Hospital 'ATTIKON', Athens, Greece
| | - Gayan Perera
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK
| | - Dag Aarsland
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK; South London and Maudsley NHS Foundation Trust, London, UK; Centre for Age-Related Medicine (SESAM), Stavanger University Hospital, Stavanger, Norway
| | - Robert Stewart
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK; South London and Maudsley NHS Foundation Trust, London, UK
| | - Christoph Mueller
- King's College London, Institute of Psychiatry, Psychology and Neuroscience, London, UK; South London and Maudsley NHS Foundation Trust, London, UK.
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