cerebral edema
Summary
Cerebral edema is the accumulation of excess fluid in brain tissue, leading to increased intracranial pressure (ICP). It can be classified as vasogenic (blood-brain barrier breakdown), cytotoxic (cellular swelling), or interstitial (CSF accumulation). Cerebral edema is a life-threatening condition that can cause brain herniation and death.
Detail
Cerebral edema occurs through three main mechanisms: (1) Vasogenic edema results from blood-brain barrier disruption, allowing plasma proteins and fluid to leak into the extracellular space - commonly seen with brain tumors, abscesses, and hemorrhages. (2) Cytotoxic edema involves cellular swelling due to failure of Na+/K+-ATPase pumps, typically following hypoxic-ischemic injury, causing neurons and glia to swell. (3) Interstitial edema occurs when CSF moves from ventricles into periventricular white matter, seen in hydrocephalus. All types increase intracranial pressure, which can lead to decreased cerebral perfusion pressure (CPP = MAP - ICP), brain herniation syndromes (uncal, central, tonsillar), and death. Clinical manifestations include headache, altered mental status, papilledema, focal neurological deficits, and Cushing's triad (hypertension, bradycardia, irregular breathing). Treatment focuses on reducing ICP through osmotic agents (mannitol, hypertonic saline), corticosteroids (for vasogenic edema), hyperventilation (temporary measure), and sometimes surgical decompression.
Sources
- Robbins and Cotran Pathologic Basis of Disease
- Adams and Victor's Principles of Neurology
- First Aid for the USMLE Step 1
- Harrison's Principles of Internal Medicine
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