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Delirium accelerates cognitive decline in Alzheimer disease
1Institute for Aging Research, Hebrew SeniorLife, 1200 Centre Street, Boston, MA 02131, USA. tfong@bidmc.harvard.edu
Neurology
|May 6, 2009
Summary
Delirium significantly accelerates cognitive decline in Alzheimer's disease (AD) patients. Experiencing delirium leads to a faster rate of cognitive decline compared to those without delirium.
Area of Science:
- Neuroscience
- Gerontology
- Clinical Neurology
Background:
- Alzheimer's disease (AD) is a progressive neurodegenerative disorder.
- Delirium is a common complication in elderly patients, particularly those with dementia.
- The impact of delirium on the cognitive trajectory in AD patients requires further investigation.
Purpose of the Study:
- To investigate the effect of delirium on cognitive decline in a cohort of Alzheimer's disease patients.
- To quantify the rate of cognitive change in AD patients who experience delirium versus those who do not.
Main Methods:
- Secondary analysis of a prospective patient registry from the Massachusetts Alzheimer's Disease Research Center.
- Cognitive performance assessed using the Information-Memory-Concentration (IMC) subtest of the Blessed Dementia Rating Scale.
- Linear mixed regression models used to compare cognitive decline rates, controlling for covariates.
Main Results:
- Patients who developed delirium showed an accelerated rate of cognitive decline.
- The average decline in IMC score was 2.5 points/year before delirium and 4.9 points/year after.
- Cognitive decline occurred approximately three times faster in patients with delirium compared to those without.
Conclusions:
- Delirium significantly accelerates cognitive decline in individuals with Alzheimer's disease.
- Findings suggest that preventing delirium may be a strategy to slow cognitive deterioration in AD.
- Further research, including intervention studies, is warranted to confirm these findings.
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