Long-term cognitive impairment after critical illness.

Area of Science:

• Neuroscience
• Critical Care Medicine
• Public Health

Background:

• Survivors of critical illness frequently experience prolonged and disabling cognitive impairment.
• The precise characterization of this post-ICU cognitive dysfunction remains an area of active research.

Purpose of the Study:

• To characterize long-term cognitive impairment in survivors of critical illness.
• To investigate the association between in-hospital delirium and post-discharge cognitive outcomes.

Main Methods:

• Adults with respiratory failure or shock in the ICU were assessed for delirium.
• Global cognition and executive function were evaluated at 3 and 12 months post-discharge using standardized neuropsychological tests.
• Linear regression analysis examined the association of delirium duration and sedative/analgesic use with cognitive outcomes.

Main Results:

• 74% of patients developed in-hospital delirium.
• At 3 months post-discharge, 40% had global cognition deficits comparable to moderate traumatic brain injury.
• A longer duration of delirium was independently associated with worse global cognition and executive function at both 3 and 12 months.

Conclusions:

• Medical and surgical ICU patients are at high risk for persistent cognitive impairment.
• Prolonged in-hospital delirium duration is a significant predictor of worse long-term cognitive function.
• Further research and interventions are needed to mitigate post-ICU cognitive deficits.