Multisystem: Shock, Sepsis and Metabolic Syndromes · USMLE Step 1

A 70-year-old woman with urosepsis develops acute respiratory distress syndrome (ARDS). Which finding is most characteristic of ARDS physiology?

  1. Increased lung compliance
  2. Decreased diffusion barrier
  3. Noncardiogenic pulmonary edema
  4. Reduced alveolar protein content
Show answer and explanation

Correct answer: Noncardiogenic pulmonary edema

ARDS is caused by increased pulmonary capillary permeability leading to noncardiogenic pulmonary edema. This causes decreased compliance and impaired oxygenation.

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