Journal
CRITICAL CARE MEDICINE
Volume 38, Issue 7, Pages 1513-1520Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/CCM.0b013e3181e47be1
Keywords
delirium; intensive care units; mechanical ventilation; cognitive impairment; aged
Categories
Funding
- Saint Thomas Foundation (Nashville, TN)
- National Institutes of Health [AG001023, AG034257, HL007123, RR024975]
- Veterans Affairs Tennessee Valley Geriatric Research, Education, and Clinical Center (GRECC)
- Hartford Geriatrics Health Outcomes Research Scholars Award Program
- Vanderbilt Physician Scientist Development Program
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Objective: To test the hypothesis that duration of delirium in the intensive care unit is an independent predictor of long-term cognitive impairment after critical illness requiring mechanical ventilation. Design: Prospective cohort study. Setting: Medical intensive care unit in a large community hospital in the United States. Patients: Mechanically ventilated medical intensive care unit patients who were assessed daily for delirium while in the intensive care unit and who underwent comprehensive cognitive assessments 3 and 12 mos after discharge. Measurements and Main Results: Of 126 eligible patients, 99 survived >= 3 months after critical illness; long-term cognitive outcomes were obtained for 77 (78%) patients. Median age was 61 yrs, 51% were admitted with sepsis/ acute respiratory distress syndrome, and median duration of delirium was 2 days. At 3-mo and 12-mo follow-up, 79% and 71% of survivors had cognitive impairment, respectively (with 62% and 36% being severely impaired). After adjusting for age, education, preexisting cognitive function, severity of illness, severe sepsis, and exposure to sedative medications in the intensive care unit, increasing duration of delirium was an independent predictor of worse cognitive performance-determined by averaging age-adjusted and education-adjusted T-scores from nine tests measuring seven domains of cognition-at 3-mo (p = .02) and 12-mo follow-up (p = .03). Duration of mechanical ventilation, alternatively, was not associated with long-term cognitive impairment (p = .20 and .58). Conclusions: In this study of mechanically ventilated medical intensive care unit patients, duration of delirium (which is potentially modifiable) was independently associated with long-term cognitive impairment, a common public health problem among intensive care unit survivors. (Crit Care Med 2010; 38: 1513-1520
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