What are the stages of empyema and the appropriate management for each stage?

Empyema Stages and Management

Empyema progresses through three distinct stages with specific management strategies for each: Stage I (exudative) requires antibiotics and tube thoracostomy; Stage II (fibrinopurulent) should be treated with VATS as first-line surgical approach; and Stage III (organizing/chronic) requires decortication, preferably via VATS when feasible. 1

The Three Stages of Empyema

Stage I: Exudative Phase (Early/Acute)

• Characteristics: Thin, free-flowing pleural fluid with low viscosity
• Pathophysiology: Simple parapneumonic effusion with pH >7.20, glucose >2.2 mmol/L
• Duration: Develops within first few days of infection

Management Approach:

• Antibiotics plus tube thoracostomy (chest tube drainage)
• Therapeutic thoracentesis may suffice in selected cases
• Monitor for progression to Stage II 2, 3, 4

Stage II: Fibrinopurulent Phase (Transitional)

• Characteristics: Turbid, thick fluid with fibrin deposition and septation formation
• Pathophysiology: pH <7.20, glucose <2.2 mmol/L, positive bacterial cultures common
• Duration: Typically 7-14 days after initial infection
• Key feature: Loculations develop, making simple drainage inadequate

Management Approach - The Critical Decision Point:

VATS should be the first-line surgical approach for Stage II empyema rather than prolonged conservative management or immediate thoracotomy 1. This represents a paradigm shift from traditional stepwise escalation.

Goals of intervention:

1. Complete evacuation of infected material
2. Full lung re-expansion (lung must touch chest wall and diaphragm)

When VATS fails or is not achieving these goals:

• Convert to open thoracotomy without delay
• Conversion rates range 0-41% (average ~11%)
• No specific time limit defined, but conversion should occur when "timely" progress is not achieved 1

Alternative for non-surgical candidates:

• Combination intrapleural tPA (10 mg twice daily) + DNase (5 mg twice daily) for 3 days 2
• Important caveat: Single-agent tPA or DNase alone should NOT be used
• Streptokinase is no longer recommended 2

Stage III: Organizing/Chronic Phase

• Characteristics: Thick fibrous peel forms over visceral pleura, creating a "trapped lung"
• Pathophysiology: Granulation tissue and fibrous membrane prevent lung expansion
• Clinical signs: Hemithorax contraction, rib space narrowing, mediastinal shift toward affected side
• Duration: Typically >3 weeks from initial infection

Management Approach:

Decortication is the definitive treatment for Stage III empyema in medically operable patients (Class IIa recommendation) 1. This involves:

• Peeling fibrous peel from visceral (and sometimes parietal) pleura
• Debridement of all infected tissue
• Resection of frankly necrotic lung if present (avoid extensive resections due to fistula risk)
• Closure of bronchopleural fistulas when present
• Muscle/omental flaps for space obliteration if needed

Surgical approach preference:

• VATS decortication preferred over thoracotomy when feasible 2, 5
• Open thoracotomy reserved for cases where VATS cannot achieve complete decortication
• Choice depends on surgeon experience, patient condition, and extent of pleural involvement

For non-operative candidates:

• Open window thoracostomy (Eloesser flap) as palliative or bridge to definitive surgery 1

Critical Clinical Pearls

Common Pitfall: Waiting too long at each stage before escalating therapy. The literature consistently shows that early surgical intervention (particularly VATS in Stage II) reduces morbidity, hospital stay, and mortality compared to prolonged conservative management 5, 3.

The "Triphasic Parallel" Concept: While empyema has three stages, management does NOT need to follow a rigid stepwise progression (tube → VATS → thoracotomy). VATS can and should be used as first-line therapy even in advanced stages 1.

Microbiological considerations:

• Positive cultures obtained in only ~36% of cases 6
• S. aureus and S. pneumoniae predominate
• Don't delay surgical intervention waiting for culture results

Pediatric differences: In children, primary operative approach (VATS) or intrapleural fibrinolysis are both effective first-line options, with VATS showing lower mortality and shorter hospital stays 1, 2.

Epidural anesthesia: Can be used safely in empyema patients who are otherwise low risk for epidural abscess (Class IIb) 1.

Algorithmic Decision Framework

1. Confirm empyema stage via imaging (ultrasound/CT) and pleural fluid analysis
2. Stage I: Antibiotics + chest tube → if no improvement in 24-48 hours, advance to Stage II management
3. Stage II or mixed II/III: Proceed directly to VATS (not prolonged tube drainage)
4. Stage III with trapped lung: Decortication (VATS preferred) if medically operable
5. At any VATS procedure: Convert to thoracotomy immediately if unable to achieve evacuation and expansion

The evidence strongly supports aggressive early surgical intervention over prolonged conservative management, as this approach reduces overall morbidity and mortality 5, 7.