Staphylococcus aureus pneumonia as a complication during treatment of neurosurgical patients with mechanical...

Area of Science:

• Infectious Diseases
• Critical Care Medicine
• Pulmonary Medicine

Background:

• Staphylococcus aureus pneumonia is a significant concern in intensive care settings.
• Mechanical ventilation is a known risk factor for hospital-acquired pneumonia.
• Cerebral lesions may alter patient susceptibility to infections.

Purpose of the Study:

• To investigate the incidence and potential causes of Staphylococcus aureus pneumonia in patients with cerebral lesions undergoing mechanical hyperventilation.
• To differentiate between impaired local defense mechanisms and increased pathogen exposure as reasons for higher infection rates.

Main Methods:

• Retrospective epidemiological analysis comparing infection rates between patient groups.
• Phage typing of Staphylococcus aureus isolates to assess strain relatedness.
• Clinical observation of infection course and diagnostic methods.

Main Results:

• A high incidence of Staphylococcus aureus pneumonia (11/54) was observed in patients with cerebral lesions on mechanical hyperventilation, compared to other ventilated patients (1/148).
• Patients with cerebral lesions showed increased colonization with Staphylococcus aureus.
• Colonizing and infecting strains of Staphylococcus aureus were often different phage types, suggesting endogenous or altered host factors rather than exogenous epidemic strains.

Conclusions:

• The increased Staphylococcus aureus infection rate in ventilated patients with cerebral lesions is likely due to specific impairments in local respiratory tract defense mechanisms.
• Early diagnosis of Staphylococcus aureus pneumonia is crucial and can be aided by microscopic examination of endotracheal suction material.