Noncardiogenic (microvascular) pulmonary edema is best described by which combination?

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Multiple Choice

Noncardiogenic (microvascular) pulmonary edema is best described by which combination?

Noncardiogenic (microvascular) pulmonary edema occurs when the alveolar–capillary barrier is damaged, causing fluid to leak into the interstitium and alveoli despite normal left-sided filling pressures. The key clue is that the edema is driven by increased capillary permeability, not by high hydrostatic pressure. Clinically this shows up as edema with a normal pulmonary capillary wedge pressure, distinguishing it from cardiogenic edema. So the best description is increased permeability with normal pulmonary pressure. The alternative pattern—high hydrostatic pressure with elevated wedge pressure—fits cardiogenic edema from left-heart failure, not noncardiogenic edema. Decreased permeability would not produce the typical edema seen in this context, and decreased hydrostatic pressure would not drive edema either.

Noncardiogenic (microvascular) pulmonary edema occurs when the alveolar–capillary barrier is damaged, causing fluid to leak into the interstitium and alveoli despite normal left-sided filling pressures. The key clue is that the edema is driven by increased capillary permeability, not by high hydrostatic pressure. Clinically this shows up as edema with a normal pulmonary capillary wedge pressure, distinguishing it from cardiogenic edema.

So the best description is increased permeability with normal pulmonary pressure. The alternative pattern—high hydrostatic pressure with elevated wedge pressure—fits cardiogenic edema from left-heart failure, not noncardiogenic edema. Decreased permeability would not produce the typical edema seen in this context, and decreased hydrostatic pressure would not drive edema either.

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