Wernicke-Korsakoff syndrome

Wernicke-Korsakoff syndrome

Wernicke-Korsakoff syndrome (also called wet brain, Korsakoff psychosis, alcoholic encephalopathy, Wernicke's disease, and encephalopathy - alcoholic) [ [http://www.nlm.nih.gov/medlineplus/ency/article/000771.htm MedlinePlus Medical Encyclopedia: Wernicke-Korsakoff syndrome ] ] is a manifestation of thiamine deficiency, or beri-beri. This is usually secondary to alcohol abuse.

Korsakoff's Psychosis and Wernicke's encephalopathy

The syndrome is a combined manifestation of two eponymous disorders, Korsakoff's Psychosis and Wernicke's encephalopathy, named after Drs. Sergei Korsakoff and Carl Wernicke.

Wernicke's encephalopathy is characterized by:
#confusion
#nystagmus
#ophthalmoplegia
#anisocoria
#ataxia
#sluggish pupillary reflexes
#coma and death if untreated

Korsakoff's psychosis is characterized by
#anterograde and retrograde amnesia.
#confabulation.

Causes

Wernicke-Korsakoff syndrome results from thiamine deficiency. It is generally agreed that Wernicke's encephalopathy results from severe acute deficiency of thiamine (Vitamin B1), whilst Korsakoff's psychosis is a chronic neurologic sequela after Wernicke's encephalopathy. The metabolically active form of thiamin is thiamin diphosphate which plays a major role as a cofactor Coenzyme in glucose metabolism. The enzymes which are dependent on thiamin diphosphate are associated with the TCA Cycle and catalyse the oxidation of pyruvate,alphaketoglutarate and branched chain amino acids. Thus, anything that encourages glucose metabolism will exacerbate an existing clinical or sub-clinical thiamine deficiency.

As stated above, Wernicke-Korsakoff in the United States is usually found in malnourished chronic alcoholics, though it is also found in patients who undergo prolonged intravenous (IV) therapy without (Vitamin B1) supplementation, gastric stapling or intensive care unit (ICU) stays. In some regions, physicians have observed thiamin deficiency brought about by severe malnutrition, particularly in diets consisting mainly of polished rice, which is thiamine deficient. The resulting nervous system ailment is called Beriberi. In individuals with sub-clinical thiamine deficiency, a large dose of glucose (either as sweet food etc or glucose infusion), can precipitate the onset of overt encephalopathy. [cite journal |author=Zimitat C, Nixon P, |title= Glucose loading precipitates encephalopathy in thiamine-deficient rats |journal= Metabolic Brain Disease |volume=14 |issue=1 |pages=1–10 |year=2000 |doi= 10.1023/A:1020653312697 ] cite journal |author=Navarro D, Zwingmann C, Chatauret N, Butterworth RF |title=Glucose loading precipitates focal lactic acidosis in the vulnerable medial thalamus of thiamine-deficient rats |journal=Metab Brain Dis |volume=23 |issue=1 |pages=115–22 |year=2008 |month=March |pmid=18034292 |doi=10.1007/s11011-007-9076-z |url=]

Wernicke-Korsakoff syndrome in alcoholics especially is associated with atrophy of specific regions of the brain, especially the mamillary bodies. Other regions include the anterior region of the thalamus (accounting for amnesic symptoms), the medial dorsal thalamus, the basal forebrain, and median and dorsal raphe nuclei. [cite journal |author=Mann K, Agartz I, Harper C, Shoaf S et al|title=Neuroimaging in alcoholism: ethanol and brain damage |journal=Alcohol Clin Exp Res |volume=25 |issue=5 Suppl ISBRA |pages=104S–109S |year=2001 |pmid=11391058]

One as-yet-unreplicated study has associated susceptibility to this syndrome with a hereditary deficiency of transketolase, an enzyme involved in thiamine metabolism. [cite journal |author=Nixon P, Kaczmarek M, Tate J, Kerr R, Price J |title=An erythrocyte transketolase isoenzyme pattern associated with the Wernicke-Korsakoff syndrome |journal=Eur J Clin Invest |volume=14 |issue=4 |pages=278–81 |year=1984 |pmid=6434322 |doi=10.1111/j.1365-2362.1984.tb01181.x]

Diagnosis and findings

Diagnosis of Wernicke-Korsakoff syndrome is by clinical impression and can sometimes be confirmed with formal Neuropsychological assessment. Wernicke's encephalopathy typically presents with ataxia and nystagmus, and Korsakoff's psychosis with anterograde and retrograde amnesia and confabulation upon relevant lines of questioning.

Frequently, for unknown reasons, patients with Korsakoff's psychosis will exhibit marked degeneration of the mamillary bodies. The mechanism of this degeneration is unknown, but it supports current neurological theory that the mamillary bodies play a role in various "memory circuits" within the brain. An example of a memory circuit is the Papez circuit.

Treatment

Treatment consists of reversing the thiamine deficiency by giving supplemental thiamine, usually by starting with an initial intravenous or intramuscular dose followed by supplemental oral doses. It is important to start the thiamine treatment before giving any glucose as the encephalopathy will be worsened by the glucose. (Glucose administration promotes dehydrogenation of pyruvate, a biochemical reaction which consumes thiamine.) By the time amnesia and psychosis have occurred, complete recovery is unlikely. Fact|date=October 2008

References


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