Management of Left Pleural Effusion

Initial Assessment and Management

The American Thoracic Society recommends that the management of a left pleural effusion should begin with therapeutic thoracentesis in symptomatic patients to relieve dyspnea and determine the effect on symptoms, while asymptomatic patients can be observed without intervention 1, 2
Observation is recommended if the patient is asymptomatic or has no recurrence of symptoms after initial thoracentesis, as up to 25% of patients with pleural effusions are asymptomatic at presentation 1, 3
The majority of asymptomatic patients will eventually become symptomatic and require intervention, and consultation with a thoracic malignancy multidisciplinary team is recommended for recurrent effusions, even if initially asymptomatic 3

The American College of Chest Physicians recommends that either an indwelling pleural catheter (IPC) or chemical pleurodesis is used as first-line definitive intervention for recurrent symptomatic effusions with expandable lung 2
For talc pleurodesis, either talc poudrage or talc slurry can be used with similar efficacy, and chemical pleurodesis requires complete lung expansion after pleural space drainage, a diffuse inflammatory reaction and local activation of the coagulation system, and absence of endobronchial obstruction or trapped lung 2, 4, 5

Pleural fluid pH and glucose levels can be used to predict prognosis, with lower values correlating with poorer prognosis 6, 7
Bronchoscopy is not routinely indicated but should be performed when endobronchial lesions are suspected, large effusions without contralateral mediastinal shift are present, or there is absence of lung expansion after therapeutic thoracentesis 8

Complete success is defined as long-term relief of symptoms with absence of fluid reaccumulation on chest radiographs until death, partial success is defined as diminution of dyspnea with only partial reaccumulation of fluid (<50% of initial), and failed pleurodesis is defined as lack of success as defined above 6, 7

Intercostal tube drainage without pleurodesis is not recommended due to high recurrence rates, and if dyspnea is not relieved by thoracentesis, other causes such as lymphangitic carcinomatosis, atelectasis, thromboembolism, or tumor embolism should be investigated 3, 5
Quality of life considerations should focus on relief of dyspnea, minimizing discomfort, and limiting hospitalization time 6, 7