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The authors of this large cohort study show that one-third of older people with delirium in hospital will develop dementia within 5 years.
In the longest and largest cohort study of delirium patients to date Leighton et al 1 report that one-third of people aged over 65 diagnosed with delirium in hospital will develop dementia, and another half will be dead, within 5 years.
Inherent in the use of pre-existing data to establish a cohort of participants without a diagnosis of dementia, especially as far back as 1996, is the risk of including people with undiagnosed dementia. It is likely that a sizeable proportion of older people diagnosed with delirium in hospital has undiagnosed dementia.2 This is supported by the fact that 9% were diagnosed with dementia in the first 6 months after their hospital-based delirium diagnosis, which implies a likely dementia at the time of their delirium.
The second …
Contributors This is my own work.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.