Prolonged cognitive dysfunction in survivors of critical illness

Area of Science:

• Critical care medicine
• Neuropsychology
• Rehabilitation science

Background:

• Survivors of critical illness often experience long-term cognitive deficits.
• Executive function is particularly vulnerable after intensive care unit (ICU) stays.

Purpose of the Study:

• To prospectively evaluate cognitive performance and executive function in critical illness survivors.
• To track changes in cognitive function during the first year post-ICU.

Main Methods:

• Prospective study of 51 critical illness survivors (ICU stay >= 3 days).
• Neuropsychological testing (Raven's Progressive Matrices, Hayling Sentence completion, Six-Element Test) at 3 and 9 months post-discharge.
• General health assessed using Short-Form 36.

Main Results:

• At 3 months post-discharge, all Short-Form 36 domains were impaired; 35% of patients had significant cognitive deficits.
• By 9 months, four Short-Form 36 domains improved, and only 4% of patients showed significant cognitive impairment.
• Cognitive performance improved over time but remained below normal levels.

Conclusions:

• Critical illness survivors experience significant cognitive and executive dysfunction post-ICU.
• Recovery is evident within the first year, but deficits may persist.
• Long-term monitoring and rehabilitation are crucial for this patient population.