Vascular permeability pulmonary edema is characterized by what mechanism?

Vascular permeability pulmonary edema is characterized by what mechanism?

• A. Endothelial injury causing increased permeability and leakage of protein-rich fluid into alveoli
• B. Decreased capillary permeability leading to dry lungs
• C. Lymphatic obstruction causing edema without fluid in alveoli
• D. Purely hydrostatic pressure increase without injury to endothelium

Answer: (A)

The key idea is how pulmonary edema arises from capillary leak due to endothelial injury. When the pulmonary capillary endothelium is damaged, its barrier function is lost and permeability rises. fluid and large molecules, including proteins, leak from the capillaries into the alveolar spaces. This creates an exudative, protein-rich edema fluid in the alveoli, impairing gas exchange and often contributing to surfactant dysfunction and hypoxemia—patterns seen in noncardiogenic edema/ARDS. If edema were from increased hydrostatic pressure alone, the fluid would be a transudate with low protein content, accumulating mainly due to elevated pressures rather than endothelial injury. Lymphatic obstruction causes edema mainly by impaired drainage and tends to be interstitial rather than alveolar flooding with protein-rich fluid. So the mechanism described—endothelial injury leading to increased permeability and leakage of protein-rich fluid into the alveoli—best fits vascular permeability pulmonary edema.

The key idea is how pulmonary edema arises from capillary leak due to endothelial injury. When the pulmonary capillary endothelium is damaged, its barrier function is lost and permeability rises. fluid and large molecules, including proteins, leak from the capillaries into the alveolar spaces. This creates an exudative, protein-rich edema fluid in the alveoli, impairing gas exchange and often contributing to surfactant dysfunction and hypoxemia—patterns seen in noncardiogenic edema/ARDS.

If edema were from increased hydrostatic pressure alone, the fluid would be a transudate with low protein content, accumulating mainly due to elevated pressures rather than endothelial injury. Lymphatic obstruction causes edema mainly by impaired drainage and tends to be interstitial rather than alveolar flooding with protein-rich fluid. So the mechanism described—endothelial injury leading to increased permeability and leakage of protein-rich fluid into the alveoli—best fits vascular permeability pulmonary edema.