Management of Pleural Effusions

Initial Assessment and Treatment

For pleural effusions, intensification of diuretic therapy, particularly loop diuretics with or without aldosterone antagonists, should be the first-line treatment approach before considering invasive procedures, especially in transudative effusions due to heart failure or fluid overload 1
Diagnostic thoracentesis should be conducted to classify the effusion as exudative or transudative, and consider serum NT-proBNP to support diagnosis of heart failure in unilateral effusions 2
Observation with no intervention is recommended unless needed for diagnosis, with scheduled clinical and radiological follow-up 3, 4
Diagnostic evaluation should begin with thoracic ultrasound, followed by diagnostic thoracocentesis to classify the effusion as exudative or transudative, and subsequently implement specific treatment according to the etiology and symptoms 4, 2

Diuretics have a limited role in primary management of exudative effusions, which require treatment of the underlying cause 1
Patients may require higher diuretic doses or more intensive dialysis 1
Optimization of treatment for heart failure is recommended 1

Monitor for complications as these patients have a poorer prognosis (6-month mortality 31%, 1-year mortality 46%) 1
Consider thoracentesis or other invasive procedures when diuretic therapy fails to resolve symptoms, patient requires multiple increases in diuretics over a 6-month period with continued fluid overload, diagnostic uncertainty exists, or pleural effusion is recurrent or refractory 1, 5
Aggressive diuresis can lead to preload depletion and decreased cardiac output 5

Thoracic ultrasound should be performed in all patients with suspected pleural effusion to confirm presence, evaluate characteristics (size, loculations), identify signs of malignancy, and guide invasive procedures 2
Ultrasound-guided diagnostic thoracocentesis reduces the risk of pneumothorax (1.0% vs 8.9%) and decreases the need for chest tube placement 4
Computed Tomography (CT) is indicated when thoracocentesis is unsafe, when malignancy is suspected, or when evaluation of non-expandable lung is required 4, 2

Therapeutic thoracentesis is recommended for palliation, with a recurrence rate of approximately 100% at 1 month (British Thoracic Society) 3
Repeated therapeutic thoracocentesis may be performed for symptomatic relief, with caution not to drain more than 1.5L in a single session 3, 6
Chemical pleurodesis via chest tube is an option, with a success rate of 93% when using talc (European Respiratory Society) 3, 7
The European Respiratory Society recommends thoracoscopy with talc poudrage for recurrent effusions, with a success rate of 90% 3
Complete drainage (<150 ml/24h) should be achieved before removing the chest tube after pleurodesis 6, 3

For chemotherapy-responsive tumors, systemic treatment combined with local therapy is recommended (National Comprehensive Cancer Network, American Society of Clinical Oncology) 3, 7
Bronchoscopy should be considered if the lung fails to expand after drainage, to rule out bronchial obstruction (American College of Chest Physicians) 3, 7
For refractory cases, options include talc pleurodesis (93% success rate), indwelling pleural catheter, or pleuroperitoneal shunt for selected patients with expected survival >6 months 7
Indwelling pleural catheter (IPC) is preferred for symptomatic effusions with non-expandable lung, and attempts at pleurodesis should be avoided as they will be ineffective 4, 7
Suspect trapped lung when there is lack of mediastinal shift on chest radiograph with large effusion or when pleural fluid pressure is <10 cm H₂O at thoracentesis (American College of Chest Physicians) 7

Chest tube drainage is recommended for complicated parapneumonic effusions or empyema (Infectious Diseases Society of America) 3, 4
Appropriate antibiotics should be used according to cultures and antibiogram 4
Surgical intervention should be considered if there is no improvement with drainage (American Thoracic Society) 3, 4
Infections associated with permanent pleural catheters should be treated without initially removing the catheter, with catheter removal considered if the infection does not improve 4