A pleural fluid analysis shows: protein 5.1 g/dL (serum protein 6.8 g/dL), LDH 380 U/L (serum LDH 240 U/L), pH 7.18, glucose 42 mg/dL. This meets Light's criteria for an exudate. Given pH < 7.2 and glucose < 60 mg/dL, what is the immediate management?

• A Observe and repeat thoracentesis in 48 hours
• B IV antibiotics alone — complicated parapneumonic effusion without empyema needs no drainage
• C VATS decortication is the first-line approach before chest tube
• D Immediate chest tube drainage (intercostal drain) — complicated parapneumonic effusion / early empyema ✓

Explanation

This pleural fluid profile (exudate with pH < 7.2, glucose < 60 mg/dL, and markedly elevated LDH) classifies it as a complicated parapneumonic effusion or empyema, which requires immediate drainage. Intercostal tube drainage is the first-line intervention; intrapleural fibrinolytics (alteplase + DNase) may be instilled if the fluid is loculated. pH < 7.2 (or < 7.0 for frank empyema) is the most important indicator for drainage. VATS decortication is reserved for organized empyema (Stage III) unresponsive to drainage and fibrinolytics. Antibiotics alone are insufficient.

Reference: Harrison's Principles of Internal Medicine, 21st ed.

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Written and medically reviewed by the StethoPrep medical team.