A 50-year-old man presents with fever, productive cough, and right-sided pleuritic chest pain for 5 days. Chest X-ray shows right lower lobe consolidation with a moderate pleural effusion. Diagnostic thoracentesis reveals cloudy fluid with a pH of 7.12, glucose 35 mg/dL, and LDH 800 IU/L. Which of the following is the most appropriate next step in management?

• A Continue intravenous antibiotics with close observation
• B Perform surgical decortication
• C Administer intrapleural streptokinase
• D Insert an intercostal chest drain for drainage ✓

Explanation

In a parapneumonic effusion, a pleural fluid pH below 7.2 indicates a complicated effusion that will not resolve with antibiotics alone and requires tube thoracostomy. Observation is insufficient for this pH level. Intrapleural fibrinolytics are reserved for loculated effusions failing initial drainage, not as first-line therapy. Surgical decortication is indicated only for chronic empyema or failed drainage. Therefore, immediate chest drain insertion is the correct step.

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

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Written and medically reviewed by the StethoPrep medical team.