British Journal of Anaesthesia, 2002, Vol. 89, No. 2 231-236
© 2002 The Board of Management and Trustees of the British Journal of Anaesthesia
Clinical Investigations |
Alveolar and serum oxidative stress in ventilator-associated pneumonia
1 Department of Anaesthesiology and Intensive Care, Hotel-Dieu Hospital, 1 Place de lhôpital, F-69288 Lyon cedex 02, France. 2 Department of Biochemistry, Edouard Herriot Hospital, Lyon, France*Corresponding author
Background. In several lung diseases, oxidative stress can be demonstrated. This has not been shown in patients with ventilator-associated pneumonia (VAP).
Methods. We studied plasma and bronchoalveolar lavage (BAL) samples for markers of oxidative stress, taken from patients with VAP. Seventy-eight patients likely to have VAP and 10 patients who were not suspected of having VAP were studied prospectively. A diagnosis of VAP was based on a positive quantitative mini-lavage culture of
103 colony-forming units per ml. Blood and BAL samples were collected and analysed for thiobarbituric acid reactant substances (TBARS) and antioxidant activity.
Results. Plasma and alveolar TBARS increased significantly in patients who developed VAP compared with those who did not, by 43% and 259% respectively. Red cells and alveolar glutathione peroxidase concentrations (antioxidant activity) were lower in those with VAP compared with the non-VAP group, by 43% and 68% respectively. No significant differences were found for serum superoxide dismutase activity. Significant differences were found for alveolar glutathione peroxidase concentrations over time in the VAP group. No significant differences between survivors and non-survivors were found in the blood or BAL assays, in patients with VAP.
Conclusions. VAP is associated with evidence of early oxidative stress in the alveolar fluid and blood.
Br J Anaesth 2002; 89: 2316
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