Cerebral edema: Difference between revisions
Content deleted Content added
m robot Adding: nl:Hersenoedeem |
←Replaced content with 'rowena rocks hahaha' |
||
| Line 1: | Line 1: | ||
rowena rocks hahaha |
|||
{{DiseaseDisorder infobox | |
|||
Name = {{PAGENAME}} | |
|||
Image = | |
|||
Caption = | |
|||
ICD10 = {{ICD10|G|93|6|g|90}} | |
|||
ICD9 = {{ICD9|348.5}} | |
|||
ICDO = | |
|||
OMIM = | |
|||
DiseasesDB = 2227 | |
|||
MedlinePlus = | |
|||
eMedicineSubj = | |
|||
eMedicineTopic = | |
|||
MeshID = D001929 | |
|||
}} |
|||
'''Cerebral edema''' (cerebral oedema in [[British English]]) is an excess accumulation of water in the intracellular and/or extracellular spaces of the [[brain]]. |
|||
==Types== |
|||
===Vasogenic cerebral edema=== |
|||
Due to a breakdown of tight endothelial junctions which make up the [[blood-brain barrier]] (BBB). This allows normally excluded intravascular proteins and fluid to penetrate into cerebral parenchymal extracellular space. |
|||
Once plasma constituents cross BBB the edema spreads, this may be quite fast and widespread. As water enters white matter it moves extracellularly along fiber tracts and can also affect the gray matter. |
|||
This type of edema is seen in response to trauma, tumors, focal inflammation, late stages of cerebral [[ischemia]] and hypertensive [[encephalopathy]]. |
|||
Some of the mechanisms contributing to BBB dysfunction are: physical disruption by arterial hypertension or trauma, tumor-facilitated release of vasoactive and endothelial destructive compounds (e.g. arachidonic acid, excitatory neurotransmitters, eicosanoids, bradykinin, histamine and free radicals). |
|||
===Cytotoxic cerebral edema=== |
|||
In this type of edema the BBB remains intact. |
|||
This edema is due to the derangement in cellular [[metabolism]] resulting in inadequate functioning of the sodium and potassium pump in the [[glial cell]] membrane. As a result there is cellular retention of sodium and water. There are swollen astrocytes in gray and white matter. Cytoxotic edema is seen with various intoxications ([[dinitrophenol]], [[triethyltin]], [[hexachlorophene]], [[isoniazid]]), in [[Reye's syndrome]], severe [[hypothermia]], early [[ischemia]], [[encephalopathy]], early [[stroke]] or [[Hypoxia (medical)|hypoxia]], cardiac arrest, pseudotumor cerebri, and cerebral toxins. |
|||
===Osmotic edema=== |
|||
Normally cerebral-spinal fluid (CSF) and extracellular fluid (ECF) osmolality of the brain is slightly greater than that of plasma. When plasma is diluted by excessive water intake (or [[hyponatremia]]), [[syndrome of inappropriate antidiuretic hormone]] secretion (SIADH), [[hemodialysis]], or rapid reduction of blood [[glucose]] in hyper[[osmolar]] [[hyperglycemic]] state (HHS), formerly [[hyperosmolar non-ketotic acidosis]] (HONK), the brain osmolality will then exceed the serum osmolality creating an abnormal pressure gradient down which water will flow into the brain causing edema. It affects the brain so severely that the victim feels like drowning until he/she dies the slow painful death. |
|||
===Hydrostatic edema=== |
|||
This form of cerebral edema is seen in acute, malignant hypertension. It is thought to result from direct transmission of pressure to cerebral capillary with transudation of fluid into the ECF. |
|||
===Interstitial cerebral edema=== |
|||
Occurs in obstructive hydrocephalus. |
|||
This form of edema is due to rupture of CSF-brain barrier: permits CSF to penetrate brain and spread in the extracellular space of white matter. Differentiated from vasogenic edema in that fluid contains almost no protein |
|||
===High Altitude Cerebral Edema=== |
|||
[[High altitude cerebral edema]] (or '''[[HACE]]''') is a severe (usually fatal) form of [[altitude sickness]]. HACE is the result of swelling of brain tissue from fluid leakage. Symptoms can include headache, loss of coordination (ataxia), weakness, and decreasing levels of consciousness including disorientation, loss of memory, hallucinations, psychotic behavior, and coma. It generally occurs after a week or more at [[high altitude]]. Severe instances can lead to death if not treated quickly. Immediate descent is a necessary life-saving measure (2,000 - 4,000 feet). There are some medications (e.g. [[dexamethasone]]) that may be prescribed for treatment in the field, but these require proper medical training in their use. Anyone suffering from HACE must be evacuated to a medical facility for proper follow-up treatment. A [[gamow bag]] can sometimes be used to stabilize the sufferer before transport or descending. |
|||
Climbers may also suffer [[high altitude pulmonary edema]] ([[HAPE]]), which affects the lungs. While not as life threatening as HACE in the initial stages, failure to descend to lower altitudes or receive medical treatment can also lead to death. |
|||
==Treatment== |
|||
Treatment approaches can include [[diuretics]] and [[corticosteroids]].<ref name="pmid17613230">{{cite journal |author=Raslan A, Bhardwaj A |title=Medical management of cerebral edema |journal=Neurosurgical focus |volume=22 |issue=5 |pages=E12 |year=2007 |pmid=17613230 |doi= |doi=10.3171/foc.2007.22.5.13}}</ref> |
|||
==References== |
|||
<references/> |
|||
==External links== |
|||
*[http://www.altitude.org Altitude.org] |
|||
{{CNS diseases of the nervous system}} |
|||
[[Category:Cerebrum]][[Category:Mountaineering]] |
|||
[[de:Hirnödem]] |
|||
[[it:Edema cerebrale]] |
|||
[[nl:Hersenoedeem]] |
|||
[[pl:Obrzęk mózgu]] |
|||
[[fi:Aivoödeema]] |
|||
Revision as of 00:51, 26 May 2008
rowena rocks hahaha