A 28-year-old woman presents with acute onset severe left-sided pleuritic chest pain, dyspnea, and fever (39°C). Chest X-ray shows a left-sided pleural effusion. Pleural fluid analysis reveals: WBC 8,000/μL (90% neutrophils), protein 4.2 g/dL, LDH 450 IU/L, glucose 85 mg/dL, negative bacterial culture, and negative AFB smear. She is hemodynamically stable with SpO₂ 94% on room air. What is the most appropriate immediate next step?
A. Initiate high-dose NSAIDs and supportive care with close clinical monitoring
B. Perform chest tube insertion and continuous drainage of pleural fluid
C. Start empiric broad-spectrum antibiotics and repeat pleural fluid culture after 48 hours
D. Perform thoracentesis for diagnostic confirmation and start antibiotics based on culture results
Explanation
Clinical Context
This patient presents with acute pleurisy with an exudative pleural effusion. The pleural fluid analysis has already been performed (results are provided in the stem), revealing: neutrophilic predominance (90%), elevated protein (4.2 g/dL) and LDH (450 IU/L), normal glucose (85 mg/dL), negative bacterial culture, and negative AFB smear. She is hemodynamically stable with SpO₂ 94% on room air.
Pathophysiology of Acute Pleurisy
Key Point
Acute pleurisy represents acute inflammation of the pleura. The pleural fluid profile here — exudate with neutrophilic predominance, negative cultures, and normal glucose — is most consistent with viral or idiopathic pleurisy, NOT bacterial empyema (which typically shows low glucose <60 mg/dL, positive cultures, and frank pus).
High-Yield (Light's Criteria): This is an exudative effusion (protein >3 g/dL, LDH >200 IU/L), but the negative cultures and normal glucose argue strongly against bacterial infection or empyema.
Why Option C (NSAIDs + Supportive Care) Is Correct
Since thoracentesis has already been performed and results are available, the next step is management, not further diagnostics. Given:
Negative bacterial culture and AFB smear → no indication for empiric antibiotics
Normal glucose → rules out empyema and rheumatoid pleurisy
Hemodynamically stable, SpO₂ 94% → no indication for chest tube drainage
Clinical picture consistent with viral/idiopathic pleurisy
The appropriate management is:
1.
High-dose NSAIDs (e.g., ibuprofen 600–800 mg TID or indomethacin 25–50 mg TID) — first-line for viral/idiopathic pleurisy per Harrison's Principles of Internal Medicine
2.
Supportive care (analgesics, rest, cough suppression)
3.
Close clinical monitoring for resolution or development of complications
Clinical Pearl
Per Harrison's (21st ed.), NSAIDs are the cornerstone of treatment for viral/idiopathic pleurisy. Colchicine may be added for recurrent cases. Antibiotics are NOT indicated in the absence of bacterial infection evidence.
Why Other Options Are Incorrect
Option A (Chest tube): Reserved for empyema (pH <7.2, glucose <60, positive culture/Gram stain, or frank pus). This patient does not meet criteria.
Option B (Empiric antibiotics): Not indicated when cultures are negative and clinical picture favors viral etiology with normal glucose. Overuse of antibiotics is inappropriate here.
Option D (Thoracentesis): Already performed — this is logically incoherent as a "next step" since the pleural fluid results are already provided in the stem.
High-YieldNEET PG
The triad of pleuritic chest pain + exudative neutrophilic effusion + negative cultures + normal glucose = viral/idiopathic pleurisy → treat with NSAIDs and monitor.
Reference: Harrison's Principles of Internal Medicine, 21st ed., Chapter on Diseases of the Pleura; Light RW. Pleural Diseases, 6th ed.
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