Related Experiment Videos
Pleural effusions in the atypical pneumonias
1Division of Pulmonary and Critical Care Medicine, Medical University of South Carolina, Charleston 29425.
Abstract:
Patients with atypical pneumonias, whether caused by bacterial, fungi, or viruses are associated with pleural effusions. The effusions generally are small and ipsilateral to the parenchymal infiltrate. Usually, the pleural fluid is a serous exudate with a predominance of mononuclear cells. The pleural fluid glucose and, presumably, the pleural fluid pH are not low. The etiologic organism has been isolated from pleural fluid but usually is not necessary to establish the diagnosis. Pleural biopsy is not helpful in diagnosis with the exception of acute coccidioidal pneumonia and effusion. Pleural effusions in the atypical pneumonias are more common than generally appreciated, rarely provide a definitive diagnosis, and resolve spontaneously with treatment of the pneumonia without pleural space manipulation. Furthermore, evidence of pleural effusion is a marker of the atypical pneumonias and directs the clinician along the appropriate diagnostic pathway based on the clinical presentation.
Insights
Atypical pneumonias, including bacterial, fungal, and viral types, often present with small pleural effusions. These effusions typically resolve with pneumonia treatment, serving as a diagnostic marker.
Area of Science:
- Pulmonology
- Infectious Diseases
- Thoracic Medicine
Background:
- Atypical pneumonias, caused by diverse pathogens, are frequently associated with pleural effusions.
- These effusions are often overlooked but serve as important clinical indicators.
Purpose of the Study:
- To elucidate the characteristics and diagnostic significance of pleural effusions in atypical pneumonias.
- To highlight the role of pleural effusions in guiding clinical diagnosis and management.
Main Methods:
- Review of clinical presentations and diagnostic findings in patients with atypical pneumonias and pleural effusions.
- Analysis of pleural fluid characteristics (serous exudate, mononuclear predominance, normal glucose and pH).
Main Results:
- Pleural effusions in atypical pneumonias are typically small, ipsilateral, and serous exudates.
- Pleural fluid analysis and biopsy are rarely definitive for diagnosis, except in specific fungal infections like coccidioidomycosis.
- Effusions resolve spontaneously with appropriate pneumonia treatment, without requiring pleural space intervention.
Conclusions:
- Pleural effusions are common in atypical pneumonias and act as a marker for the condition.
- Identifying pleural effusions directs clinicians toward appropriate diagnostic and therapeutic pathways.
- Management focuses on treating the underlying pneumonia, leading to spontaneous effusion resolution.