Which procedure demonstrates the transudative nature of the pleural fluid in hepatic hydrothorax?

Which procedure demonstrates the transudative nature of the pleural fluid in hepatic hydrothorax?

• A. Thoracentesis
• B. Pleural biopsy
• C. Thoracostomy
• D. Mediastinoscopy

Answer: (A)

Transudative pleural effusions arise from systemic factors that alter pressures, such as portal hypertension and hypoalbuminemia in cirrhosis. In hepatic hydrothorax, ascitic fluid moves through small diaphragmatic defects into the pleural space, producing a fluid that is typically low in protein and LDH. To demonstrate this transudative nature, you need to sample the pleural fluid and analyze it using criteria that distinguish transudate from exudate (Light’s criteria). Thoracentesis provides the pleural fluid for this analysis, allowing assessment of protein and LDH levels and their ratios to serum values. Pleural biopsy would assess tissue pathology rather than fluid characteristics; thoracostomy drains fluid but doesn’t establish its composition; mediastinoscopy isn’t relevant to pleural fluid analysis.

Transudative pleural effusions arise from systemic factors that alter pressures, such as portal hypertension and hypoalbuminemia in cirrhosis. In hepatic hydrothorax, ascitic fluid moves through small diaphragmatic defects into the pleural space, producing a fluid that is typically low in protein and LDH. To demonstrate this transudative nature, you need to sample the pleural fluid and analyze it using criteria that distinguish transudate from exudate (Light’s criteria). Thoracentesis provides the pleural fluid for this analysis, allowing assessment of protein and LDH levels and their ratios to serum values. Pleural biopsy would assess tissue pathology rather than fluid characteristics; thoracostomy drains fluid but doesn’t establish its composition; mediastinoscopy isn’t relevant to pleural fluid analysis.