A 58-year-old man with community-acquired pneumonia develops a moderate left parapneumonic effusion. Diagnostic tap: pH 7.15, glucose 38 mg/dL, LDH 900 IU/L, WBC 12,000/uL neutrophil predominant. Gram stain shows gram-positive diplococci. What is the correct next step?
- A Insert an intercostal chest tube for drainage along with antibiotics ✓
- B Continue intravenous antibiotics alone and repeat the tap in 48 hours
- C Reassure, as the fluid is a benign transudate
- D Start oral diuretics and restrict fluids
Correct answer: A. Insert an intercostal chest tube for drainage along with antibiotics
Explanation
Pleural pH below 7.20 identifies a complicated parapneumonic effusion requiring urgent tube drainage to prevent organization into a fibrothorax. Positive Gram stain and organisms confirm an infected space. Antibiotics alone fail because they penetrate poorly into acidic, low-glucose pleural fluid. Diuretics address transudates, and this exudate with pH 7.15, LDH 900 and glucose 38 mg/dL is clearly not benign.
Reference: Harrison's Principles of Internal Medicine, 21st ed.
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Written and medically reviewed by the StethoPrep medical team.