A 40-year-old male presents with a pleural effusion. Thoracocentesis: protein 4.8 g/dL, LDH 380 IU/L, glucose 42 mg/dL, pH 7.18, WBC 15,000/μL (predominantly neutrophils). Gram stain is negative. Serum protein 7.2 g/dL, serum LDH 240 IU/L. What is the next best step in management?

• A Repeat thoracocentesis in 48 hours
• B IV antibiotics alone and monitor
• C Video-assisted thoracoscopic surgery (VATS)
• D Chest tube drainage (tube thoracostomy) ✓

Explanation

This effusion meets LIGHT's criteria for an exudate (pleural:serum protein >0.5, pleural:serum LDH >0.6, pleural LDH > 2/3 upper limit of serum LDH). The low glucose <60 mg/dL, low pH <7.20, and high neutrophilic WBC indicate a complicated parapneumonic effusion or frank empyema. Per BTS and IDSA guidelines, complicated parapneumonic effusions (pH <7.20, glucose <60, positive culture or frank pus) mandate immediate chest tube drainage. IV antibiotics alone are insufficient. VATS is reserved for loculated empyemas failing tube drainage.

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

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Written and medically reviewed by the StethoPrep medical team.