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Empyema with bronchopleural fistula — Clinical Guidelines

Overview

Postpneumonectomy empyema (PPE) is a severe and potentially life-threatening complication characterized by the accumulation of purulent material in the pleural space following pneumonectomy. It often complicates the clinical course, particularly when associated with a bronchopleural fistula (BPF), which can lead to significant morbidity and mortality rates ranging from 20% to over 70% depending on the presence of the fistula and underlying disease state 1 5. PPE predominantly affects patients with underlying malignancies but can also occur in those with non-malignant conditions. Early and aggressive management is crucial due to the high risk of septic complications and the potential for rapid deterioration, especially in immunocompromised patients 1 7. Effective treatment strategies are essential in thoracic surgical practice to improve patient outcomes and reduce mortality.

Pathophysiology

The pathophysiology of PPE involves a complex interplay of factors following pneumonectomy. Initially, surgical trauma and compromised lung function create an environment conducive to infection. Poorly vascularized pleural tissues and the presence of necrotic lung tissue provide a fertile ground for bacterial colonization 1. The development of a BPF exacerbates the condition by allowing continuous contamination of the pleural space with airway secretions, leading to persistent infection and difficulty in achieving sterile conditions 2 5. This cycle of infection and inflammation can progress to systemic sepsis, further complicating the clinical picture and necessitating multifaceted therapeutic interventions.

Epidemiology

Postpneumonectomy empyema occurs with an incidence ranging from 2% to 16%, with higher rates noted in specific subgroups such as those undergoing completion pneumonectomy, right pneumonectomy, or surgeries complicated by perioperative sepsis or mediastinal lymph node dissections 1 5. The condition predominantly affects older adults, often with underlying malignancies, though it can occur in any patient who has undergone pneumonectomy. Geographic and demographic factors do not significantly alter the incidence but may influence access to specialized care and outcomes. Trends over time suggest that advancements in surgical techniques and perioperative care have marginally reduced incidence rates, though the severity and mortality remain high 1 5.

Clinical Presentation

Patients with PPE typically present with symptoms of systemic infection, including fever, chills, and malaise, alongside local manifestations such as chest pain, dyspnea, and cough productive of purulent sputum 1 3. The presence of a BPF may be indicated by air leak, recurrent pneumothorax, or continuous drainage of purulent material. Red-flag features include signs of septic shock, such as hypotension, tachycardia, and altered mental status, which necessitate urgent intervention 1 7. Prompt recognition of these symptoms is critical for timely management and improved outcomes.

Diagnosis

The diagnostic approach for PPE involves a combination of clinical assessment, imaging, and microbiological analysis. Key diagnostic criteria include:

Clinical Symptoms: Fever, chest pain, dyspnea, and purulent sputum 1.

Imaging: Chest CT or chest X-ray showing pleural effusion with loculations, air bubbles indicative of a BPF, and signs of lung destruction 1 3.

Microbiological Confirmation: Pleural fluid analysis with positive cultures, elevated white blood cell count, and pH < 7.0 1 5.

Bronchoscopy: May be necessary to identify and manage BPF 2 7.

Differential Diagnosis:

Postoperative Pneumonia: Typically lacks the purulent effusion and loculations seen in empyema 3.

Chylothorax: Presents with milky pleural fluid, often without signs of systemic infection 3.

Metastatic Pleural Mesothelioma: May present with pleural effusion but lacks the characteristic purulent nature 5.

Management

Initial Management

Antibiotic Therapy: Broad-spectrum antibiotics tailored based on culture and sensitivity results; initial empirical choices might include piperacillin-tazobactam or meropenem 1 5.

Drainage: Chest tube insertion for continuous drainage of purulent fluid 1 6.

Surgical Interventions

Repeated Mechanical Debridement: As per the Zurich approach, repeated debridement with povidone-iodine-soaked packing under suction, followed by temporary chest closure and eventual definitive closure after microbiological clearance 1.

Open Window Thoracostomy (OWT): Creation of an open thoracostomy for continuous drainage and packing, particularly useful in cases with persistent infection 6.

Bronchopleural Fistula Management:

- Tracheobronchial Stent Insertion: Conical stent placement to occlude the fistula 2. - Vascularized Flap Closure: Use of omentoplasty or pectoralis muscle flaps for BPF closure in refractory cases 7.

Refractory Cases

Thoracoplastic Procedures: Advanced surgical techniques such as pleuropneumonectomy via transparasternal transpericardial approach for chronic cases 4.

Multidisciplinary Approach: Collaboration with infectious disease specialists, thoracic surgeons, and intensivists for complex cases 1 5.

Contraindications:

Severe systemic instability precluding surgery.

Uncontrolled sepsis unresponsive to medical management.

Complications

Recurrent Infection: Persistent BPF or inadequate debridement can lead to recurrent empyema 1 6.

Respiratory Failure: Due to extensive lung damage or persistent air leaks 3.

Systemic Complications: Septic shock, multi-organ dysfunction, and mortality 1 5.

Referral Triggers: Persistent fever, worsening respiratory status, or signs of systemic infection warrant immediate specialist referral 1 7.

Prognosis & Follow-up

The prognosis for PPE varies significantly based on the presence of a BPF and underlying health status, with mortality rates ranging from 20% to over 50% 1 5. Prognostic indicators include early recognition, successful closure of BPF, and absence of systemic complications. Follow-up should include regular chest imaging to monitor for recurrence and pulmonary function tests to assess lung health. Recommended intervals for follow-up are typically every 3-6 months initially, tapering off as stability is achieved 1 5.

Special Populations

Elderly Patients: Higher risk of complications and poorer tolerance to aggressive interventions 1.

Immunocompromised Patients: Increased susceptibility to persistent infection and slower recovery 1 7.

Pediatrics: Rare but requires specialized pediatric thoracic surgical expertise 3.

Specific Comorbidities: Presence of chronic lung disease or malignancy significantly impacts treatment strategies and outcomes 1 5.

Key Recommendations

Early Aggressive Surgical Intervention: Repeated mechanical debridement and temporary chest closure (Evidence: Strong 1).

Targeted Antibiotic Therapy: Tailored based on pleural fluid cultures (Evidence: Moderate 5).

Management of BPF: Use of stents or vascularized flaps for closure (Evidence: Moderate 2 7).

Multidisciplinary Care: Collaboration among thoracic surgeons, infectious disease specialists, and intensivists (Evidence: Expert opinion 1).

Continuous Monitoring and Drainage: Utilize chest tubes for ongoing drainage and reassessment (Evidence: Moderate 6).

Preventive Measures: Minimize perioperative sepsis and ensure meticulous bronchial closure during pneumonectomy (Evidence: Moderate 5).

Regular Follow-Up: Monitor for recurrence and assess pulmonary function post-treatment (Evidence: Expert opinion 1).

Consider Advanced Techniques: For refractory cases, explore thoracoplastic procedures (Evidence: Weak 4).

Close Surveillance of Immunocompromised Patients: Given higher risk of complications (Evidence: Expert opinion 7).

Prompt Referral for Complex Cases: Ensure timely specialist intervention for persistent or severe infections (Evidence: Expert opinion 1).

References

1 Monsch GM, Etienne H, Hillinger S, Caviezel C, Lauk O, Opitz I et al.. Accelerated treatment concept in postpneumonectomy empyema with bronchopleural fistula. Scientific reports 2024. link 2 Andreetti C, Menna C, D'Andrilli A, Ibrahim M, Maurizi G, Poggi C et al.. Multimodal Treatment for Post-Pneumonectomy Bronchopleural Fistula Associated With Empyema. The Annals of thoracic surgery 2018. link 3 Zanotti G, Mitchell JD. Bronchopleural Fistula and Empyema After Anatomic Lung Resection. Thoracic surgery clinics 2015. link 4 Morimoto K, Taniguchi I, Nakamura Y, Maeda T, Saiki M, Yamaga T. Transparasternal transpericardial operation in the treatment of chronic empyema with bronchopleural fistula. The Japanese journal of thoracic and cardiovascular surgery : official publication of the Japanese Association for Thoracic Surgery = Nihon Kyobu Geka Gakkai zasshi 2002. link 5 Wain JC. Management of late postpneumonectomy empyema and bronchopleural fistula. Chest surgery clinics of North America 1996. link 6 Shamji FM, Ginsberg RJ, Cooper JD, Spratt EH, Goldberg M, Waters PF et al.. Open window thoracostomy in the management of postpneumonectomy empyema with or without bronchopleural fistula. The Journal of thoracic and cardiovascular surgery 1983. link 7 Virkkula L, Eerola S. Use of pectoralis skin pedicle flap for closure of large bronchial fistula connected with postpneumonectomy empyema. Scandinavian journal of thoracic and cardiovascular surgery 1975. link

Empyema with bronchopleural fistula