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Diagnostic value of proinflammatory interleukins in parapneumonic effusions
M Esther San José1, Luis Valdes, F Javier Gonzalez-Barcala
1Bioquímica Especial, Central Laboratory and Department of Pneumology, Complejo Hospitalario Universitario de Santiago de Compostela, La Coruña, Spain.
American Journal of Clinical Pathology
|May 18, 2010
Summary
Diagnosing pneumonia-related pleural effusion is challenging due to frequent negative microbiology. This study found Interleukin-1beta and pleural fluid neutrophils effectively aid in diagnosing parapneumonic/empyematous effusion.
Area of Science:
- Pulmonology
- Biochemistry
- Clinical Diagnostics
Background:
- Pleural effusion complicates pneumonia in ~40% of cases.
- Microbiology results are often negative, necessitating clinical diagnosis.
- Accurate diagnosis of exudative pleural effusions, particularly parapneumonic/empyematous types, remains a clinical challenge.
Purpose of the Study:
- To evaluate the diagnostic utility of Interleukin (IL)-6, IL-8, and IL-1beta in pleural fluid for differentiating types of pleural effusion.
- To assess the role of pleural fluid cell populations, specifically neutrophils, in effusion diagnosis.
- To determine if combinations of biomarkers can improve diagnostic accuracy for parapneumonic/empyematous effusion.
Main Methods:
- Analyzed pleural fluid and serum from 266 patients with diverse pleural effusions (infectious, tuberculous, paraneoplastic, miscellaneous exudates, transudates).
- Measured concentrations of IL-6, IL-8, and IL-1beta in pleural fluid and serum.
- Assessed pleural fluid cell counts, focusing on neutrophils (PNEU), and performed Receiver Operating Characteristic (ROC) curve analysis.
Main Results:
- Interleukin-6 showed high specificity (97.4%) but low sensitivity (38.2%) for parapneumonic/empyematous effusion.
- Interleukin-8 and pleural fluid neutrophils (PNEU) demonstrated moderate sensitivity and specificity.
- Interleukin-1beta exhibited good specificity (91.3%) with moderate sensitivity (55.6%).
- The combination of IL-1beta and PNEU significantly improved diagnostic yield, achieving 75.7% sensitivity and 83.1% specificity.
Conclusions:
- Individual ILs have limitations in diagnosing parapneumonic/empyematous effusion.
- Pleural fluid Interleukin-1beta combined with neutrophil count offers enhanced diagnostic accuracy.
- Biomarker combinations hold promise for improving the diagnosis of complex pleural effusions.
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