Which condition is most likely to cause a transudative pleural effusion?

Which condition is most likely to cause a transudative pleural effusion?

• A. Congestive Heart Failure
• B. Malignancy with Lymphatic Obstruction
• C. Empyema
• D. Pneumonia with Abscess

Answer: (A)

Transudative pleural effusions come from systemic forces that shift fluid across the pleural membranes with low protein content. The classic example is congestive heart failure, where high hydrostatic pressure in the pulmonary circulation pushes fluid into the pleural space. The fluid tends to be clear and low in protein and LDH. Infections like pneumonia with abscess or empyema, and malignancy with lymphatic obstruction, cause exudative effusions. These conditions involve inflammation or tumor-related processes that increase capillary permeability or block lymphatic drainage, yielding pleural fluid that is rich in protein and LDH and often has cells or pus. So congestive heart failure best fits a transudative effusion because the underlying problem is a systemic hemodynamic change (increased hydrostatic pressure) rather than local inflammation or infection.

Transudative pleural effusions come from systemic forces that shift fluid across the pleural membranes with low protein content. The classic example is congestive heart failure, where high hydrostatic pressure in the pulmonary circulation pushes fluid into the pleural space. The fluid tends to be clear and low in protein and LDH.

Infections like pneumonia with abscess or empyema, and malignancy with lymphatic obstruction, cause exudative effusions. These conditions involve inflammation or tumor-related processes that increase capillary permeability or block lymphatic drainage, yielding pleural fluid that is rich in protein and LDH and often has cells or pus.

So congestive heart failure best fits a transudative effusion because the underlying problem is a systemic hemodynamic change (increased hydrostatic pressure) rather than local inflammation or infection.