Which description best characterizes vasogenic cerebral edema?

Which description best characterizes vasogenic cerebral edema?

• A. Leakage of macromolecules from capillaries into the extracellular space
• B. Intercellular edema due to ionic shifts
• C. Cytotoxic edema due to cellular swelling
• D. Edema from venous outflow issues

Answer: (A)

Vasogenic edema occurs when the blood-brain barrier is disrupted, allowing plasma proteins and other macromolecules to leak from capillaries into the brain’s extracellular space. This extracellular fluid accumulation spreads mainly in the white matter and draws water osmotically, leading to swelling and potential mass effect. This mechanism is distinct from cytotoxic edema, where energy failure (such as ischemia) causes the Na+/K+-ATPase to fail and water shifts into cells, causing intracellular swelling. Edema from venous outflow issues involves elevated venous pressure and interstitial fluid buildup, but the defining feature of vasogenic edema is the leakage of macromolecules into the extracellular space.

Vasogenic edema occurs when the blood-brain barrier is disrupted, allowing plasma proteins and other macromolecules to leak from capillaries into the brain’s extracellular space. This extracellular fluid accumulation spreads mainly in the white matter and draws water osmotically, leading to swelling and potential mass effect. This mechanism is distinct from cytotoxic edema, where energy failure (such as ischemia) causes the Na+/K+-ATPase to fail and water shifts into cells, causing intracellular swelling. Edema from venous outflow issues involves elevated venous pressure and interstitial fluid buildup, but the defining feature of vasogenic edema is the leakage of macromolecules into the extracellular space.