Causes of Recurring Pleural Effusion

Primary Causes by Classification

The European Respiratory Society notes that heart failure accounts for more than 80% of transudative pleural effusions and is the leading cause of bilateral effusions 2, 1
Liver cirrhosis (hepatic hydrothorax) accounts for approximately 10% of transudative effusions, according to the European Respiratory Journal 2, 1
Malignancy, particularly lung cancer, is a leading cause of exudative pleural effusions, followed by breast cancer and lymphoma, as reported by the American Journal of Respiratory and Critical Care Medicine 3, 1
Tuberculosis causes approximately 6% of pleural effusions and should be considered in undiagnosed cases, according to Thorax 5, 1

Differentiation between transudates and exudates using Light's criteria is the first key step in diagnosis, with high sensitivity (98%) but moderate specificity (72%) for identifying exudates, as noted by the European Respiratory Journal 2, 7
When heart failure is suspected but Light's criteria suggest an exudate, a serum-effusion albumin gradient >1.2 g/dL can reclassify the effusion as a transudate, according to the European Respiratory Journal 2
N-terminal pro-brain natriuretic peptide (NT-BNP) levels >1500 μg/mL in serum or pleural fluid accurately diagnose heart failure as the cause, as reported by the European Respiratory Journal 2

Reconsider pulmonary embolism and tuberculosis as they are amenable to specific treatment, as suggested by Thorax and the European Respiratory Journal 5, 1
Consider indwelling pleural catheters for patients requiring frequent thoracenteses (three or more), as recommended by the European Respiratory Journal 4, 6

Most transudates can be successfully treated with diuretics, addressing the underlying cause, according to the European Respiratory Journal 2
The European Respiratory Society recommends repeat pleural aspiration before considering other interventions for refractory heart failure effusions 4
Indwelling pleural catheters may provide palliation of symptoms and reduced hospital stays in selected patients, as noted by the European Respiratory Journal 6