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Dementia and Death Risk Rises When Elderly Patients Experience Delirium

by Tanya Thomas on July 29, 2010 at 10:23 AM
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 Dementia and Death Risk Rises When Elderly Patients Experience Delirium

Review and analysis of previous research has associated an increased risk of death, dementia, and institutionalisation to delirium in elderly patients .

"Delirium is a syndrome of acutely altered mental status characterized by inattention and a fluctuating course. With occurrence rates of up to half of older patients postoperatively, and even higher in elderly patients admitted to intensive care units, delirium is the most common complication in hospitalized older people," the authors write.

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"Evidence suggests that delirium is associated with long-term poor outcome but delirium often occurs in individuals with more severe underlying disease."

Joost Witlox, M.Sc., of the Medical Center Alkmaar, the Netherlands, and colleagues conducted an analysis of previous studies to assess the association between delirium and long-term poor outcomes in elderly patients while controlling for important confounders (other factors that can influence outcomes).
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The researchers identified 51 relevant articles. The primary analyses included only high-quality studies with statistical control for age, sex, comorbid (co-existing) illness or illness severity, and baseline dementia.

The primary analysis showed that delirium was associated with an increased risk of death compared with controls after an average follow-up of 22.7 months.

"The results of this meta-analysis provide evidence that delirium in elderly patients is associated with an increased risk, of death, institutionalization, and dementia, independent of age, sex, comorbid illness or illness severity, and presence of dementia at baseline. Moreover, our stratified models confirm that this association persists when excluding studies that included in-hospital deaths and patients residing in an institution at baseline," the researchers write.

The study has been published in the July 28 issue of JAMA.

Source: ANI
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