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Updated: Jun 24, 2026
04:32
Murine Oropharyngeal Aspiration Model of Ventilator-associated and Hospital-acquired Bacterial Pneumonia
Published on: June 28, 2018
Systemic inflammatory response and increased risk for ventilator-associated pneumonia: a preliminary study
Paula Ramírez1, Miquel Ferrer, Ricardo Gimeno
1Unidad de Cuidados Intensivos, Hospital Universitario La Fe, Valencia, Spain.
Critical Care Medicine
|March 28, 2009
Summary
Interleukin-6 (IL-6) levels at admission can predict ventilator-associated pneumonia (VAP) risk in ventilated patients. Higher IL-6 levels accurately identified patients who developed VAP and helped distinguish confirmed cases.
Area of Science:
- Critical Care Medicine
- Infectious Disease Epidemiology
- Biomarker Research
Background:
- Ventilator-associated pneumonia (VAP) diagnosis and follow-up often use inflammatory markers.
- The predictive role of these markers for VAP risk remains unclear.
Purpose of the Study:
- To prospectively evaluate cytokine evolution in mechanically ventilated patients.
- To determine the predictive and diagnostic value of cytokines for VAP.
Main Methods:
- Prospective observational study in a medical intensive care unit.
- Measured sequential serum levels of IL-1, IL-6, IL-8, IL-10, and TNF-alpha in 44 ventilated patients.
- Excluded patients with active or subsequent extrapulmonary infections.
Main Results:
- Higher admission IL-6 levels (median [IQR]) were observed in patients who later developed VAP (235 [141-803] vs. 113 [60-170] pg/mL, p=0.015).
- IL-6 demonstrated 71% sensitivity and 78% specificity for predicting VAP (cutoff 198 pg/mL).
- During suspected VAP, IL-6 levels were significantly higher in confirmed cases (1131 [496-1987] vs. 236 [115-357] pg/mL, p=0.016), with 71% sensitivity and 89% specificity (cutoff 620 pg/mL).
Conclusions:
- Admission IL-6 levels serve as an early, accurate predictor of VAP risk.
- IL-6 effectively differentiates VAP from other pulmonary infiltrates.
- Study findings are limited in generalizability due to the small patient cohort.
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