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Updated: Feb 16, 2026

Murine Oropharyngeal Aspiration Model of Ventilator-associated and Hospital-acquired Bacterial Pneumonia

Murine Oropharyngeal Aspiration Model of Ventilator-associated and Hospital-acquired Bacterial Pneumonia

Published on: June 28, 2018

Relationship between hyperoxemia and ventilator associated pneumonia.

Karim Jaffal¹, Sophie Six^1,2, Farid Zerimech³

¹CHU Lille, Centre de Réanimation, Lille, France.

Annals of Translational Medicine

|December 22, 2017

Summary

This summary is machine-generated.

High oxygen levels (hyperoxemia) may increase the risk of ventilator-associated pneumonia (VAP) in mechanically ventilated patients by impairing lung defenses. Further research is needed to confirm this link and evaluate conservative oxygen strategies.

Keywords:

Hyperoxemia infection intensive care unit (ICU)ventilator-associated pneumonia (VAP)

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Area of Science:

Critical Care Medicine
Pulmonary Medicine
Infectious Diseases

Background:

Ventilator-associated pneumonia (VAP) is a significant concern in mechanically ventilated patients.
Hyperoxemia, or excessive oxygen levels, has been implicated as a potential risk factor for VAP.
Existing evidence presents conflicting results regarding the direct role of hyperoxemia in VAP pathogenesis.

Purpose of the Study:

To review and synthesize existing animal and human studies on the relationship between hyperoxemia and VAP.
To discuss the potential mechanisms by which hyperoxemia may contribute to VAP.
To explore potential interventions, such as conservative oxygen strategies, for VAP prevention.

Main Methods:

Literature review of animal and human studies investigating hyperoxemia and VAP.
Analysis of physiological effects of hyperoxemia on lung function and immune response.
Discussion of findings from retrospective studies and randomized controlled trials.

Main Results:

Hyperoxemia can lead to denitrogenation, atelectasis, impaired macrophage function, and hyperoxic acute lung injury, all potential VAP risk factors.
A large retrospective study identified hyperoxemia as an independent VAP risk factor.
Recent randomized controlled trials did not confirm a definitive role for hyperoxemia in lower respiratory tract infections.

Conclusions:

The relationship between hyperoxemia and VAP requires further investigation.
Prospective studies in carefully selected patient groups are necessary to confirm hyperoxemia's role in VAP.
Evaluating conservative versus conventional oxygen strategies is crucial for VAP incidence.