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[The diagnosis of pneumonia in the ventilated patient]
1Clinique médicale thérapeutique, Hôpital cantonal universitaire, Genève.
Abstract:
The diagnosis of ventilator-associated pneumonia is difficult to confirm because the usual clinical criteria lack predictive value. Risk factors evaluated recently serve to assess subgroups of exposed patients. Bronchoscopic bronchoalveolar lavage (BAL) or protected specimen brush, together with quantitative bacteriology, are the present method of choice for diagnosis of nosocomial pneumonia during mechanical ventilation. Nonbronchoscopic "blind" BAL catheters provide new, attractive, accurate and easy sampling techniques. This could become the technique of choice in the future. Efforts are needed to standardize diagnostic criteria, in order to allow comparisons between groups of patients or clinical trials for prevention or treatment of ventilator-associated pneumonia.
Insights
Diagnosing ventilator-associated pneumonia is challenging due to unreliable clinical signs. Quantitative bacteriology via bronchoscopic bronchoalveolar lavage (BAL) is current standard, but nonbronchoscopic BAL offers a simpler future alternative.
Area of Science:
- Critical Care Medicine
- Infectious Diseases
- Pulmonology
Background:
- Ventilator-associated pneumonia (VAP) diagnosis is challenging.
- Current clinical criteria for VAP lack predictive value.
- Risk factors help identify patient subgroups but do not confirm diagnosis.
Purpose of the Study:
- To review diagnostic methods for VAP.
- To evaluate current and emerging techniques for VAP diagnosis.
- To highlight the need for standardized diagnostic criteria.
Main Methods:
- Review of diagnostic approaches for VAP.
- Discussion of bronchoscopic bronchoalveolar lavage (BAL) and protected specimen brush.
- Evaluation of quantitative bacteriology for VAP diagnosis.
Main Results:
- Bronchoscopic BAL and quantitative bacteriology are the current gold standard for VAP diagnosis.
- Nonbronchoscopic "blind" BAL catheters offer accurate, easy sampling.
- These new techniques may become the future standard of care.
Conclusions:
- Standardization of diagnostic criteria for VAP is essential.
- Improved diagnostic methods are needed for accurate VAP assessment.
- Further research should focus on refining VAP diagnostic techniques and criteria.
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