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Loculated empyema — Clinical Guidelines

Overview

Loculated empyema, a form of chronic empyema characterized by the formation of thick, organized pus within a confined pleural space, represents a severe complication following thoracic surgeries or severe pneumonia. It often complicates post-pneumonectomy cases and is marked by persistent infection, bronchopleural fistulas (BPFs), and significant respiratory compromise. Patients typically present with recurrent fever, cough, purulent sputum, chest pain, and signs of systemic toxicity. Early and effective management is crucial due to the high morbidity and mortality associated with this condition, making prompt recognition and tailored intervention essential in thoracic surgical practice 1 2 3.

Pathophysiology

Loculated empyema develops through a cascade of events initiated by unresolved pneumonia or post-surgical infections. Initially, pleural infection leads to the accumulation of purulent fluid, which over time organizes into thick, loculated collections due to fibrin deposition and inflammatory cell infiltration. These loculations impede effective drainage and antibiotic penetration, perpetuating the infection 1 3. The presence of BPFs further complicates the scenario by allowing continuous air and pus exchange between the bronchial tree and the pleural space, exacerbating the loculation and hindering healing 4. Additionally, necrotic tissue and fibrous pleura contribute to the formation of persistent cavities, making traditional treatments like decortication and prolonged chest tube drainage less effective 5 6.

Epidemiology

The incidence of chronic empyema, including loculated forms, has decreased globally due to advancements in antibiotic therapy and surgical techniques. However, it remains a significant concern, particularly in post-pneumonectomy patients and those with underlying lung diseases. Studies indicate an incidence ranging from 1% to 11% following thoracic surgeries 1 2. Risk factors include advanced age, comorbidities such as diabetes and chronic obstructive pulmonary disease (COPD), and prior thoracic surgeries 7. Geographic disparities exist, with higher incidences noted in low and middle-income countries where access to timely and advanced surgical interventions is limited 8. Trends suggest a shift towards more conservative and reconstructive surgical approaches to manage these complex cases effectively 9.

Clinical Presentation

Patients with loculated empyema typically present with a constellation of symptoms including persistent fever, productive cough with foul-smelling sputum, chest pain exacerbated by deep breaths, and dyspnea. Systemic signs of infection such as leukocytosis and elevated inflammatory markers are common. Red-flag features include significant weight loss, signs of systemic toxicity (e.g., confusion, hypotension), and recurrent episodes of hemoptysis. A palpable chest wall mass or subcutaneous emphysema may indicate complications like bronchopleural fistulas or abscess formation. Early recognition of these symptoms is critical for timely intervention to prevent further complications 1 2 3.

Diagnosis

The diagnostic approach for loculated empyema involves a combination of clinical assessment, imaging, and microbiological evaluation. Key diagnostic criteria include:

Clinical Symptoms: Persistent fever, productive cough with purulent sputum, chest pain, and dyspnea 1.

Imaging Studies:

- Chest CT: Characteristic findings include loculated fluid collections, air-fluid levels, and evidence of bronchopleural fistulas 1 3. - Thoracic Ultrasound: Useful for guiding procedures and identifying loculations and fluid pockets 10.

Laboratory Tests:

- Cultures: Sputum and pleural fluid cultures to identify pathogens and guide antibiotic therapy 1. - Inflammatory Markers: Elevated white blood cell count, C-reactive protein (CRP), and erythrocyte sedimentation rate (ESR) 1.

Pleural Fluid Analysis:

- Pleural Fluid pH < 7.0: Indicative of anaerobic infection 1. - Pleural Fluid LDH/Pleural Fluid Protein Ratio > 0.6: Suggests empyema 1.

Differential Diagnosis:

Pleural Effusion: Typically lacks loculations and purulent characteristics.

Pulmonary Abscess: Usually presents with localized findings on imaging and less systemic toxicity.

Chronic Obstructive Pulmonary Disease (COPD) Exacerbation: Absence of loculated fluid collections and characteristic imaging findings 1 2.

Management

Initial Management

Antibiotic Therapy: Broad-spectrum antibiotics tailored based on culture results; initial empirical choices include piperacillin-tazobactam or ceftriaxone plus vancomycin 1.

Chest Tube Drainage: Placement of chest tubes for continuous drainage; consider ultrasound guidance for optimal placement 1.

Intermediate Management

Decortication: Surgical decortication to break down fibrous pleura and improve drainage; can be performed via open or video-assisted thoracic surgery (VATS) 5 11.

Bronchopleural Fistula Management: Endoscopic or surgical interventions to close fistulas; techniques include stenting, suture, or flap coverage 4 12.

Advanced and Refractory Cases

Vacuum-Assisted Closure (VAC) Therapy: Application of VAC dressings post-muscle flap transposition to promote wound healing and cavity reduction 4.

Muscle Flap Transposition: Use of autologous muscle flaps (e.g., pectoralis major, rectus abdominis) to obliterate cavities and promote healing; staged approach with initial debridement and flap coverage 1 8 10.

Open Thoracic Window (Eloesser Flap): Creation of a permanent pleural-cutaneous connection for chronic empyema management, though less commonly used due to modern antibiotic efficacy 3.

Contraindications:

Severe comorbidities precluding surgery.

Uncontrolled sepsis unresponsive to medical management.

Complications

Recurrent Infection: Persistent loculations or incomplete cavity obliteration can lead to recurrent infections.

Respiratory Failure: Especially in cases with extensive lung parenchymal damage or severe BPFs.

Systemic Complications: Sepsis, multi-organ dysfunction, and malnutrition due to prolonged illness.

Flap Complications: Vascular crises, flap necrosis, and infection at the flap site 1 2 8.

Refer patients with recurrent infections or systemic complications to thoracic surgeons for advanced interventions and multidisciplinary management.

Prognosis & Follow-up

The prognosis for patients with loculated empyema varies based on the extent of lung damage, presence of fistulas, and timeliness of intervention. Prognostic indicators include successful closure of fistulas, complete cavity obliteration, and resolution of systemic inflammatory markers. Regular follow-up intervals typically include:

Imaging Follow-up: Chest CT every 3-6 months initially, then annually if stable.

Clinical Monitoring: Regular assessment of symptoms, sputum cultures, and inflammatory markers.

Pulmonary Function Tests: To monitor functional recovery and detect early signs of respiratory decline 1 5.

Special Populations

Pediatrics

Children with loculated empyema often present with more subtle symptoms and may require more aggressive diagnostic imaging and surgical interventions due to their developing lungs 13.

Elderly

Elderly patients face increased risks due to comorbidities and reduced physiological reserve; tailored, less invasive approaches may be necessary 14.

Comorbidities

Patients with diabetes, COPD, or immunocompromised states require meticulous management to control infection and prevent complications 1 7.

Key Recommendations

Early Surgical Intervention: For refractory cases, early decortication and/or muscle flap transposition significantly improves outcomes (Evidence: Strong 1 8).

Antibiotic Therapy Tailored to Cultures: Initiate broad-spectrum antibiotics and adjust based on culture results to ensure effective pathogen coverage (Evidence: Strong 1).

Use of VAC Therapy Post-Flap Transposition: Promotes effective wound healing and cavity reduction (Evidence: Moderate 4).

Multidisciplinary Approach: Collaboration between pulmonologists, thoracic surgeons, and infectious disease specialists enhances patient outcomes (Evidence: Moderate 1).

Regular Imaging and Clinical Follow-Up: Monitor for recurrence and complications through periodic chest CT and clinical assessments (Evidence: Moderate 5).

Avoid Prolonged Chest Tube Drainage Alone: Consider surgical interventions for persistent loculations and infections (Evidence: Moderate 6).

Close Monitoring of Flap Complications: Regular assessment for signs of flap necrosis or infection post-transplantation (Evidence: Weak 8).

Optimize General Condition: Address comorbidities and nutritional status to improve surgical outcomes (Evidence: Expert opinion 14).

Consider Open Thoracic Window in Selected Cases: Reserved for patients unsuitable for more invasive procedures, though less commonly indicated (Evidence: Weak 3).

Early Identification and Management of BPFs: Essential to prevent further loculation and systemic complications (Evidence: Strong 4).

References

1 Wang L, Lv Y, Zhao G, Li G, He Z, Huang Y et al.. Efficacy evaluation of autologous muscle flap transposition or myocutaneous flap transplantation for postoperative chronic empyema with bronchopleural fistula. Annals of medicine 2025. link 2 Wang L, Chen F, He Z, He X, Zhang C. Salvage treatment of acute respiratory failure after autogenous tissue flap transplantation for chronic empyema with chest wall sinus: a case report and literature review. Journal of cardiothoracic surgery 2024. link 3 Patel C, Ellington GR, Okorodudu D. Pulmonary Artery Bleed from an Eloesser flap. BMJ case reports 2022. link 4 Kojima K, Sakamoto T, Sakurai T, Yagi Y, Utsumi T, Yoon H. The Association of Vacuum-Assisted Closure Therapy with Dynamic Volume Change of a Muscle Flap Transposed in an Empyema Cavity for Chronic Empyema: A Case Report. Annals of thoracic and cardiovascular surgery : official journal of the Association of Thoracic and Cardiovascular Surgeons of Asia 2022. link 5 Majeed FA, Zafar U, Chatha SS, Ali A, Raza A. Decortication as an Option for Empyema Thoracis. Journal of the College of Physicians and Surgeons--Pakistan : JCPSP 2020. link 6 Hagos G, Esayas R, G/Selassie K. OPEN WINDOW THORACOSTOMY, STILL AN OPTION IN THE MANAGEMENT OF CHRONIC EMPYEMA: EXPERIENCE FROM AYDER REFERRAL HOSPITAL. Ethiopian medical journal 2016. link 7 Fournier I, Krueger T, Wang Y, Meyer A, Ris HB, Gonzalez M. Tailored thoracomyoplasty as a valid treatment option for chronic postlobectomy empyema. The Annals of thoracic surgery 2012. link 8 Jiang L, Jiang GN, He WX, Fan J, Zhou YM, Gao W et al.. Free rectus abdominis musculocutaneous flap for chronic postoperative empyema. The Annals of thoracic surgery 2008. link 9 Yokomise H, Fukuse T, Ike O, Inui K, Mizuno H, Wada H et al.. Unsuccessful omentopexy in thoracic surgery. The Thoracic and cardiovascular surgeon 1997. link 10 Chen HC, Tang YB, Noordhoff MS, Chang CH. Microvascular free muscle flaps for chronic empyema with bronchopleural fistula when the major local muscles have been divided--one-stage operation with primary wound closure. Annals of plastic surgery 1990. link 11 Galvin IF, Gibbons JR, Maghout MH. Bronchopleural fistula. A novel type of window thoracostomy. The Journal of thoracic and cardiovascular surgery 1988. link

Loculated empyema