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Individuals who experience delirium during or shortly after hospitalization have a significantly greater risk of later mild cognitive impairment (MCI) or dementia as well as accelerated cognitive decline, according to a report in JAMA Neurology.
Why It’s Relevant
There is robust evidence that delirium is a risk factor for and an accelerator of dementia. However, prior studies of the impact of delirium on cognitive trajectories have focused on surgical or intensive care patients, limiting generalizability to community-dwelling adults. Further, most existing studies did not conduct objective cognitive tests prior to delirium onset and relied on medical records or other proxies of cognition.
In this study, the researchers analyzed data from the Mayo Clinic Study of Aging (MCSA), a prospective assessment of cognitive aging among residents of Olmsted County, Minnesota, undergoing comprehensive neuropsychological testing every 15 months.
By the Numbers
- A total of 3,501 MCSA participants with at least one hospitalization between 2004 and 2023 were included in the analysis.
- During a median follow-up of seven years, 75 participants (2.1%) had delirium documented within 30 days of hospitalization.
- Among participants with delirium, 48 (64%) developed MCI and 18 (24%) developed dementia during follow-up, compared with 1,043 (30.4%) and 214 (6.2%), respectively, among those without delirium.
- After adjusting for confounding factors, those who experienced delirium were 3.67 times more likely to develop MCI and 5.39 times more likely to develop dementia than those without delirium.
The Other Side
The delirium incidence of 2.1% is much lower than seen in other prospective studies and may be due to the incorporation of delirium screening in only a subset of hospital services, practice changes over the study period, and missing clinical notes. Additionally, the MCSA is based in a single county in Minnesota with above-average socioeconomic and educational status relative to the U.S. population, and the cohort is predominantly non-Hispanic White.
Takeaway Message
These findings underscore delirium as a medical emergency with lasting cognitive consequences. Clinicians should prioritize delirium prevention and counsel patients and their families regarding the potential long-term impact of delirium on cognitive health.
Related Information
Source
Allyson K. Palmer, et. al. Delirium and long-term cognitive trajectories in cognitively unimpaired adults. JAMA Neurology. Published November 2, 2026. doi:10.1001/jamaneurol.2026.4001
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