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Risk factors for infection by Acinetobacter baumannii in intubated patients with nosocomial pneumonia
J Baraibar1, H Correa, D Mariscal
1Pulmonary and Critical Care Department, Hospital Italiano, Montevideo, Uruguay.
Study Objective:
To investigate the epidemiology of infection by Acinetobacter baumannii in patients with ventilator-associated pneumonia (VAP).
Design:
Prospective clinical study.
Setting:
Three medical-surgical ICUs in teaching hospitals.
Patients:
We followed up 707 mechanically ventilated patients and 148 episodes of VAP with etiologic diagnosis.
Results:
A baumannii was isolated in 12 (8.1%) episodes in 148 patients. Five of these episodes were directly responsible for death. Using logistic regression analysis, the risk of VAP due to A baumannii was found to be high in patients with neurosurgery (odds ratio [OR]=10.03; 95% confidence interval [CI]=1.55 to 64.90), ARDS (OR=9.73; 95% CI=1.60 to 59.24), head trauma (OR=5.17; 95% CI=0.88 to 30.34), and large-volume pulmonary aspiration (OR=2.90; 95% CI=0.80 to 10.53).
Conclusions:
Intubated patients who develop pneumonia and have any of the above factors are at an increased risk of Acinetobacter infection.
Insights
Acinetobacter baumannii is a significant cause of ventilator-associated pneumonia (VAP). Patients with neurosurgery, ARDS, head trauma, or aspiration are at higher risk for this infection.
Area of Science:
- Infectious Diseases
- Critical Care Medicine
- Epidemiology
Background:
- Ventilator-associated pneumonia (VAP) is a common hospital-acquired infection.
- Acinetobacter baumannii is an opportunistic pathogen frequently implicated in VAP.
- Understanding the epidemiology of A. baumannii VAP is crucial for targeted interventions.
Purpose of the Study:
- To investigate the epidemiology of Acinetobacter baumannii infections in patients with VAP.
- To identify risk factors associated with A. baumannii VAP.
Main Methods:
- Prospective clinical study conducted in three medical-surgical ICUs.
- Follow-up of 707 mechanically ventilated patients.
- Analysis of 148 episodes of VAP with etiologic diagnosis.
Main Results:
- Acinetobacter baumannii was isolated in 8.1% of VAP episodes.
- A. baumannii VAP was directly responsible for death in 5 episodes.
- Risk factors for A. baumannii VAP included neurosurgery, ARDS, head trauma, and pulmonary aspiration.
Conclusions:
- Intubated patients developing VAP with specific risk factors face an elevated risk of Acinetobacter infection.
- Early recognition of these risk factors can guide preventative strategies.
- A. baumannii poses a significant threat in VAP cases, particularly in vulnerable patient populations.