Management of Pleural Effusion

Initial Evaluation and Management

Patients with a new pleural effusion should undergo thoracentesis as the first diagnostic step, even if they appear clinically well, according to the British Thoracic Society 3
Ultrasound must be used to confirm the presence of pleural fluid and guide thoracentesis or drain placement, as recommended by the British Thoracic Society 4, 3
Diagnostic pleural fluid samples should be collected using a fine bore (21G) needle and analyzed for protein, LDH, pH, Gram stain, AAFB stain, cytology, and microbiological culture, as suggested by the British Thoracic Society 5, 3
Pleural fluid should be sent in both sterile vials and blood culture bottles to increase diagnostic yield, according to the British Thoracic Society 5, 3

Patients with purulent or frankly bloody pleural fluid should be referred to a specialist immediately, as recommended by the British Thoracic Society 5, 1
Patients with pleural fluid pH <7.2 in non-purulent effusions with suspected infection should be referred to a specialist immediately, according to the British Thoracic Society 3
Patients with organisms identified by Gram stain or culture should be referred to a specialist immediately, as recommended by the British Thoracic Society 3
Patients with large effusions causing respiratory compromise should be referred to a specialist immediately, according to the British Thoracic Society 1
Patients with loculated effusions should be referred to a specialist immediately, as recommended by the British Thoracic Society 1

The initial assessment should determine if the clinical picture suggests a transudate (heart failure, hypoalbuminemia, dialysis), and if so, treat the underlying cause, as recommended by the British Thoracic Society 5, 3
For exudative effusions, evaluate cytology, microbiology, and biochemical markers, and if diagnosis is unclear, refer to a respiratory physician, according to the British Thoracic Society 5, 3

A respiratory physician should be involved in the management of malignant pleural effusions, as only 60% of malignant effusions can be diagnosed by cytological examination, as recommended by the American Thoracic Society 5
Asymptomatic malignant effusions can be observed without intervention, according to the American Thoracic Society 8, 7
Symptomatic malignant effusions require specialist management for definitive treatment with either pleurodesis or indwelling pleural catheter, as recommended by the American Thoracic Society 6, 7

Delaying referral for complicated parapneumonic effusions can lead to increased morbidity, as warned by the British Thoracic Society 1
Attempting pleurodesis in patients with non-expandable lung is likely to fail, according to the American Thoracic Society 8, 7
Performing intercostal tube drainage without pleurodesis for malignant effusions has a high recurrence rate, as noted by the British Thoracic Society 6, 7
Misdiagnosis, inappropriate antibiotics, and inappropriate chest tube placement can contribute to progression of pleural infection, as warned by the British Thoracic Society 1