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Association of Anemia with Cognitive Function and Dementia Among Older Adults: The Role of Inflammation
BACKGROUND: The association of anemia with cognitive function and dementia remains unclear. OBJECTIVE: We aimed to investigate the association of anemia with cognitive function and dementia risk and to explore the role of inflammation in these associations. METHODS: Within the UK Biobank, 207,203 de...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
IOS Press
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10657670/ https://www.ncbi.nlm.nih.gov/pubmed/37742647 http://dx.doi.org/10.3233/JAD-230483 |
Sumario: | BACKGROUND: The association of anemia with cognitive function and dementia remains unclear. OBJECTIVE: We aimed to investigate the association of anemia with cognitive function and dementia risk and to explore the role of inflammation in these associations. METHODS: Within the UK Biobank, 207,203 dementia-free participants aged 60+ were followed for up to 16 years. Hemoglobin (HGB) and C-creative protein (CRP) were measured from blood samples taken at baseline. Anemia was defined as HGB <13 g/dL for males and <12 g/dL for females. Inflammation was categorized as low or high according to the median CRP level (1.50 mg/L). A subset of 18,211 participants underwent cognitive assessments (including global and domain-specific cognitive). Data were analyzed using linear mixed-effects model, Cox regression, and Laplace regression. RESULTS: Anemia was associated with faster declines in global cognition (β= –0.08, 95% confidence interval [CI]: –0.14, –0.01) and processing speed (β= –0.10, 95% CI: –0.19, –0.01). During the follow-up of 9.76 years (interquartile range 7.55 to 11.39), 6,272 developed dementia. The hazard ratio of dementia was 1.57 (95% CI: 1.38, 1.78) for people with anemia, and anemia accelerated dementia onset by 1.53 (95% CI: 1.08, 1.97) years. The risk of dementia tended to be higher in people with both anemia and high CRP (1.89, 95% CI: 1.60, 2.22). There was a statistically significant interaction between anemia and CRP on dementia risk (p-interaction = 0.032). CONCLUSIONS: Anemia is associated with cognitive decline (specifically for processing speed) and increased risk of dementia, especially in people with high inflammation. |
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