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Parapneumonic effusions

R W Light, W M Girard, S G Jenkinson

    The American Journal of Medicine
    |October 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    This study found that 44% of bacterial pneumonia patients develop pleural effusions. Complicated parapneumonic effusions require prompt intervention based on pleural fluid analysis, guiding treatment decisions.

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    Area of Science:

    • Pulmonology
    • Infectious Diseases
    • Critical Care Medicine

    Background:

    • Pleural effusions are a common complication of acute bacterial pneumonia.
    • Differentiating between complicated and uncomplicated parapneumonic effusions is crucial for effective management.

    Purpose of the Study:

    • To prospectively evaluate the incidence and clinical course of pleural effusions in patients with acute bacterial pneumonia.
    • To identify criteria for classifying parapneumonic effusions and guiding therapeutic interventions.

    Main Methods:

    • Prospective evaluation of 203 patients with acute bacterial pneumonia.
    • Chest X-rays within 72 hours of admission.
    • Analysis of pleural fluid parameters including pH and lactate dehydrogenase (LDH) levels.

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    Main Results:

    • 44% of patients (90/203) developed pleural effusions.
    • Complicated parapneumonic effusions were identified by positive pleural fluid cultures or need for chest tubes.
    • Pleural fluid analysis, specifically pH < 7.00 and/or glucose < 40 mg/100 ml, indicated complicated effusions.
    • Specific pH and LDH thresholds were identified to guide decisions on tube thoracostomy.

    Conclusions:

    • Pleural fluid analysis is essential for classifying parapneumonic effusions.
    • Low pleural fluid pH or glucose levels are strong indicators for immediate tube thoracostomy.
    • Borderline cases require individualized assessment and potentially serial pleural fluid studies.