A pleural fluid analysis yields: protein 4.8 g/dL, LDH 360 U/L (serum LDH 220 U/L), pH 7.12, glucose 38 mg/dL (serum glucose 92 mg/dL), WBC 18,000 (90% neutrophils). No organisms on Gram stain. What is the MOST appropriate management?
- A Insert chest drain (tube thoracostomy) as this is a complicated parapneumonic effusion or empyema ✓
- B Therapeutic thoracentesis and reassess
- C Antibiotics alone without drainage
- D Pleurodesis with talc
Correct answer: A. Insert chest drain (tube thoracostomy) as this is a complicated parapneumonic effusion or empyema
Explanation
This is an exudate meeting Light's criteria (pleural protein/serum protein >0.5, pleural LDH/serum LDH >0.6, pleural LDH >2/3 upper normal). pH <7.2, glucose <60 mg/dL, and neutrophilic pleocytosis indicate a complicated parapneumonic effusion (stage III) that requires chest drain insertion per British Thoracic Society guidelines. Antibiotics alone are insufficient when pH <7.2 as loculation and empyema formation are likely. Simple therapeutic thoracentesis is not adequate for complicated effusions; pleurodesis is for recurrent malignant effusions.
Reference: Harrison's Principles of Internal Medicine, 21st ed.
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Written and medically reviewed by the StethoPrep medical team.