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Phagocyte priming as a prognostic indicator in the intensive care unit
Kevin McCallion1, Danny F McAuley, Denis W Harkin
1Department of Surgery, Queen's University of Belfast, Northern Ireland. k.mccallion@qub.ac.uk
The Journal of Trauma
|December 17, 2003
Summary
Phagocyte respiratory burst activity, a key immune function, changes over time in intensive care unit (ICU) patients. Reduced activity on day 3 of ICU admission is linked to higher mortality risk, indicating systemic anergy in non-survivors.
Area of Science:
- Immunology
- Critical Care Medicine
- Clinical Chemistry
Background:
- Immune cell function is critical in intensive care unit (ICU) patients.
- Phagocyte respiratory burst activity plays a role in immune response.
- Understanding temporal changes in immune markers can inform prognosis.
Purpose of the Study:
- To investigate the dynamic changes in circulating phagocyte respiratory burst activity.
- To determine the relationship between phagocyte activity and mortality in ICU patients.
Main Methods:
- Studied 37 ICU patients over 3 weeks.
- Assayed phagocyte respiratory burst activity using luminol-enhanced whole blood chemiluminescence on days 1, 3, and 7.
- Utilized Mann-Whitney U test for statistical analysis.
Main Results:
- Nonsurvivors had higher Acute Physiology and Chronic Health Evaluation II scores and base deficit compared to survivors.
- On day 3, nonsurvivors showed significantly reduced phagocyte activity (24.00% [18.00%, 56.00%]) versus survivors (38.00% [30.00%, 63.50%]).
- Phagocyte activation levels on day 3 differentiated between survivors and nonsurvivors (p = 0.047).
Conclusions:
- Phagocyte activation patterns vary in ICU patients based on the underlying condition.
- Reduced phagocyte activation on day 3 of ICU admission is a predictor of mortality.
- Systemic anergy, indicated by reduced phagocyte activation, may characterize patients at high risk of death.