Pleural Effusion: Diagnostic Approach in Adults

Area of Science:

• Pulmonology
• Diagnostic Imaging
• Internal Medicine

Background:

• Pleural effusion impacts 1.5 million US patients annually, necessitating prompt evaluation due to varied treatment options.
• Leading causes include heart failure, infection, malignancy, and pulmonary embolism, with patient history guiding initial assessment.
• Small, bilateral effusions in heart failure, cirrhosis, or kidney failure are often transudative and may not require diagnostic thoracentesis.

Purpose of the Study:

• To outline the diagnostic approach for pleural effusion.
• To highlight the role of point-of-care ultrasound and other imaging modalities.
• To detail the analysis of pleural fluid and management of complicated effusions.

Main Methods:

• Utilizing patient history and physical examination to direct diagnostic pathways.
• Employing chest radiography and point-of-care ultrasound for pleural space evaluation.
• Performing diagnostic thoracentesis with analysis of pleural fluid, including Light's criteria, pH, and cytology.

Main Results:

• Point-of-care ultrasound detects small effusions and complicated features, guiding thoracentesis to reduce complications.
• Chest radiography identifies laterality and moderate-to-large effusions.
• Computed tomography aids in excluding other dyspnea causes and suggesting complicated or malignant effusions.

Conclusions:

• Parapneumonic effusions are common exudates; a pH < 7.2 indicates complication requiring drainage.
• Malignant effusions carry a poor prognosis, especially when recurrent.
• Integrated use of imaging and fluid analysis optimizes pleural effusion diagnosis and management.