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Pleural fluid chemical analysis in parapneumonic effusions. A meta-analysis
J E Heffner1, L K Brown, C Barbieri
1Department of Medicine, St. Joseph's Hospital and Medical Center, Phoenix, Arizona 85001, USA.
Summary
Pleural fluid pH, lactate dehydrogenase (LDH), and glucose tests aid in identifying complicated parapneumonic effusions. Pleural fluid pH demonstrated the highest diagnostic accuracy in this meta-analysis, guiding clinical decisions for effusion management.
Area of Science:
- Pulmonary Medicine
- Diagnostic Accuracy
- Clinical Chemistry
Background:
- Complicated parapneumonic effusions often require pleural space drainage.
- The diagnostic utility of pleural fluid biomarkers like pH, LDH, and glucose remains debated.
- Accurate identification of complicated effusions is crucial for timely intervention.
Purpose of the Study:
- To assess the diagnostic accuracy of pleural fluid pH, LDH, and glucose for complicated parapneumonic effusions.
- To determine optimal decision thresholds for these biochemical markers.
- To evaluate the quality of existing primary studies on pleural fluid analysis.
Main Methods:
- Systematic meta-analysis of seven primary studies.
- Receiver Operating Characteristic (ROC) curve techniques were employed.
- Diagnostic accuracy was measured by the area under the ROC curve (AUC).
Main Results:
- Pleural fluid pH showed the highest diagnostic accuracy (AUC = 0.92) compared to glucose (AUC = 0.84) and LDH (AUC = 0.82).
- pH retained high accuracy (AUC = 0.89) even after excluding purulent effusions.
- Optimal pH decision thresholds ranged from 7.21 to 7.29, considering cost-prevalence.
Conclusions:
- Meta-analysis refines the application of pleural fluid chemical analysis for parapneumonic effusions.
- Pleural fluid pH is a valuable biomarker for identifying complicated effusions.
- Further high-quality primary investigations are needed to fully establish the clinical utility of these tests.