- Korsakoff's syndrome
eMedicineSubj = med
eMedicineTopic = 2405
MeshID = D020915
Korsakoff's syndrome or "Korsakov's syndrome" (Korsakoff's psychosis, amnesic-confabulatory syndrome), is a brain disorder caused by the lack of thiamine (vitamin B1) in the
brain. The syndromeis named after Sergei Korsakoff, the neuropsychiatrist who popularized the theory.
There are six major symptoms of Korsakoff's syndrome:
retrograde amnesia, severe memory loss
confabulation, that is, invented memories which are then taken as true due to gaps in memory sometimes associated with blackouts
# meager content in
# lack of
apathy- the patients lose interest in things quickly and generally appear indifferent to change.
These symptoms are caused by a deficiency of thiamine (vitamin B1), which is thought to cause damage to the
medial thalamusand possibly to the mammillary bodiesof the hypothalamus as well as generalized cerebral atrophy. [Kolb & Whishaw: "Fundamentals of Human Neuropsychology", 2003, pages 473-473]
Wernicke's encephalopathyaccompanies Korsakoff's syndrome, the combination is called the Wernicke-Korsakoff syndrome. Korsakoff's is a continuum of Wernicke's encephalopathy, though a recognised episode of Wernicke's is not always obvious.
neuronal loss, that is, damage to neurons; gliosiswhich is a result of damage to supporting cells of the central nervous system; and hemorrhageor bleeding in mammillary bodies. Damage to the dorsomedial nucleusof the thalamusis also associated with this disorder.
* Retrograde and anterograde amnesia
Paralysisof muscles controlling the eye
* Lack of insight to the condition
It was once assumed that anyone suffering from Korsakoff's syndrome would eventually need full time care. However, this is not the case and with proper treatment there is every chance that a person will remain independent and maintain a reasonable quality of life. [ [http://www.korsakoffs.com] ] Treatment involves the replacement or suppletion of
thiamineby intravenous(IV) or intramuscular(IM) injection, together with proper nutritionand hydration. However, the amnesia and brain damage caused by the disease does not always respond to thiaminereplacement therapy. In some cases, drug therapyis recommended. If treatment is successful, improvement will become apparent within two years although recovery is slow and often incomplete.
Conditions resulting in the vitamin deficiency and its effects include chronic
alcoholism, and severe malnutrition. Alcoholism is often an indicator of poor nutrition, which in addition to inflammationof the stomach lining, causes thiamine deficiency. [http://www.alzheimers.org.uk/site/scripts/documents_info.php?categoryID=200171&documentID=98] As well as alcohol abuse, causes include dietary deficiencies, prolonged vomiting, eating disorders, or the effects of chemotherapy. It can also occur in pregnant women who have a form of extreme morning sickness known as hyperemesis gravidarum. [http://www.healthatoz.com/healthatoz/Atoz/common/standard/transform.jsp?requestURI=/healthatoz/Atoz/ency/korsakoffs_syndrome.jsp Korsakoff's syndrome ] ] Mercury poisoningcan also cause it. It has also been caused by centipede("mukade") bites in Japan [ [http://www.ncbi.nlm.nih.gov/pubmed/2022129?dopt=Citation Centipede bites in Japan. [Cutis. 1991 - PubMed Result ] ] .
Due to malnutrition and a lack of Thiamine, the
hippocampusbegins to decay, leaving holes that disallows one's rehearsed information within short term memory to transfer to long term memory ( anterograde amnesia).However long term memory prior to the disorder can remain intact.
The most effective method of preventing Korsakoff's syndrome is to avoid B vitamin/thiamine deficiency. In Western nations the most common cause of such deficiency is alcoholism. Thiamine was introduced to alcoholic beverages in the U.S. for a time, but this does not appear to have an effect on Korsakoff's syndrome, as the cause of Korsakoff's syndrome in chronic alcoholics is not a deficiency of thiamine in the diet, but rather a reduction in the body's ability to absorb thiamine in the intestine. In the U.S., government mandates to adding thiamine to alcoholic beverages have been blocked for this reason and also by political groups asserting that such supplementation would encourage alcohol use.Fact|date=March 2008
Also, alcohol is, by itself, neurotoxic. It will cause neural damage taken in excess, especially in the
hippocampus. The body responds to alcohol ingestion by releasing cortisol as a neuroprotective mechanism (animals that have been adrenalectomized may be killed by a fraction of the dose of alcohol that an unadrenalectomized animal may tolerate). Cortisol, specifically, has been shown to cause irreversible damage to the hippocampuswhen present in large amounts for extended periods of time. [ [http://www.tianeptine.com/cortisol-stress.html Tree shrews, cortisol, and the hippocampus ] ] Alcohol in excess may be causal in and of itself in Korsakoff dementia regardless of thiamine addition to spirits. Alcohol toxicity is cumulative; cessation of its use, or never having used it, will reduce risk of korsakoff and other dementias.
A famous case study is recounted by
Oliver Sacksin "The Lost Mariner", which can be found in " The Man Who Mistook His Wife for a Hat".
Other cases include that of artist
Charles Blackman[ [http://www.theage.com.au/news/arts/artists-wonderland-is-back-in-town/2006/07/28/1153816384482.html Artist's wonderland is back in town - Arts - Entertainment - theage.com.au ] ] and entertainer Graham Kennedy. [ [http://web.archive.org/web/20050619210114/http://www.bulletin.ninemsn.com.au/bulletin/site/articleIDs/6D71054423628356CA25700D0005E365 Bulletin - Graham Kennedy ] ]
In popular culture
*In the fictional show "House", episode "Histories", the clinic patient suffers from Korsakoff's as a result of malnutrition.
*In the novel "
Mona Lisa Overdrive", the character Slick was incarceratedin a "chemo-penal unit" with "induced Korsakov's" (sic).
*In the British movie
The Wrong Box, Peter Sellersplays a doctor suffering from Korsakoff's syndrome, who is reduced to signing reports of more than questionable medical content, while telling everybody of his former lavish Mayfair office, where only the Lords and Counts used to be his clientèle.
* [http://www.untitledtheater.com/plays/strangers-linguish.html "Strangers"] is a play by [http://www.untitledtheater.com/Edwardbio.htm Edward Einhorn] based on the syndrome.
* [http://www.merck.com/mrkshared/mmanual/home.jsp The Merck Manual] : [http://www.merck.com/mrkshared/mmanual/section14/chapter169/169.jsp Function And Dysfunction Of The Cerebral Lobes] - [http://www.merck.com/mrkshared/mmanual/section14/chapter169/169e.jsp Amnesias - Korsakoff's syndrome]
* [http://www.healthatoz.com/healthatoz/Atoz/ency/korsakoffs_syndrome.jsp Simple description of Korsakoff's syndrome]
* [http://en.citizendium.org/wiki/Korsakoff%27s_syndrome Citizendium's article on Korsakoff's syndrome]
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