Anaemia and incidence of post stroke dementia

Myint, Phyo, Macleod, Mary Joan, Clark, Allan, Smith, Toby, Bettencourt-Silva, Joao H., Metcalf, Anthony K and Potter, John (2020) Anaemia and incidence of post stroke dementia. Clinical Neurology and Neurosurgery, 191.

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Abstract

Objectives: To assess the impact of anaemia on incidence of post-stroke dementia. Patients and Methods: We used data from a UK regional stroke register. To be eligible, patient must have survived to discharge and had anaemia by WHO criteria. Dementia status and other prevalent co-morbidities were assessed using ICD-10 codes. Patients were followed till May 2015 (mean follow-up 3.7 years, total person years = 27,769). Hazard Ratio for incident dementia was calculated using Cox-proportional hazards model controlling for potential confounders. Fine and Gray model was additionally constructed using mortality as the competing risk. Results: A total of 7,454 stroke patients were included with mean age (SD) of 75.9(12.3) years (50.2% men). Those with anaemia were older, has higher disability and co-morbidity burden prior to stroke. We observed a large amount of variation in the dementia incidence rates over time and that the hazard ratio increased every year. The significant association between anaemia and dementia incidence was lost after controlling for pre-stroke Modified Rankin score (HR1.17(0.97,1.40)). With every 20g/dL increase in Hb was associated with a significant reduction in the risk of dementia after adjustment for age, sex, stroke factors and disability but lost significance after adjustment for vascular risk factors. Competing risk analyses showed similar results. Conclusion: Whilst we found no evidence of anaemia as a risk factor for post-stroke dementia, the findings may be limited by potential under recognition of post stroke dementia.

Item Type: Article
Uncontrolled Keywords: anaemia,stroke,comorbidity,dementia,cognitive impairment
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
Faculty of Medicine and Health Sciences > School of Health Sciences
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 21 Jan 2020 03:16
Last Modified: 21 Sep 2020 23:58
URI: https://ueaeprints.uea.ac.uk/id/eprint/73704
DOI: 10.1016/j.clineuro.2020.105688

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