Wernicke-Korsakoff syndrome

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Wernicke-Korsakoff syndrome
Thiamine
ICD-10	E51.2, F106
ICD-9	294.0
OMIM	277730
MedlinePlus	000771
MeSH	D020915

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Cafer Zorkun, M.D., Ph.D. [2]; Aditya Govindavarjhulla, M.B.B.S. [3]

Synonyms and keywords: Alcohol induced encephalopathy; transketolase defect; Korsakoff psychosis; alcoholic encephalopathy

Overview

Wernicke-Korsakoff syndrome is a is a degenerative brain disorder cause by thiamine deficiency. This is usually secondary to alcohol abuse. Although Wernicke's and Korsakoff's may appear to be two different disorders, they are generally considered to be different stages of the same disorder, which is called Wernicke-Korsakoff syndrome. Wernicke's encephalopathy represents the "acute" phase of the disorder, and Korsakoff's amnesic syndrome represents the "chronic" phase.

Historical Perspective

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

Pathophysiology

Wernicke-Korsakoff syndrome results from thiamin deficiency. It is generally agreed that Wernicke's encephalpathy results from severe acute deficiency of thiamine (Vitamin B₁), whilst Korsakoff's psychosis results from chronic deficiency of thiamin. The metabolically active form of thiamin is thiamin diphosphate which plays a major role as a cofactor 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.When Wernicke's encephalopathy accompanies 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.

There is an unreplicated study that has associated susceptiblity to this syndrome with a hereditary deficiency of transketolase, an enzyme involved in thiamine metabolism.

Pathology

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. Korsakoff's involves neuronal loss, that is, damage to neurons; gliosis which is a result of damage to supporting cells of the central nervous system; and hemorrhage or bleeding in mammillary bodies. Damage to the dorsomedial nucleus of the thalamus is also associated with this disorder. 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.

Causes

• Malnourishment
• Chronic alcoholism
• Prolonged intravenous therapy
• Gastric stapling
• ICU stays
• Chronic intake of polished rice
• Large dose of glucose in thiamine deficient individuals

Epidemiology and Demography

• In France, a country with one of the highest per capita consumptions of alcohol, the prevalence of the WKS was found to be only 0.4% in a small retrospective autopsy study.
• Prevalence rates in Australia are highest 2.8%.
• Per capita consumption of alcohol is not corelating with the prevalence of the syndrome in many countries.

Age

• It is more common in middle aged persons.

Gender

• It is more common in men.

Diagnosis

Symptoms

Korsakoff's psychosis is characterized by

• confusion
• anterograde and retrograde amnesia.
• confabulation

Other important symptoms of Korsakoff's psychosis are

• meager content in conversation
• lack of insight
• apathy - the patients lose interest in things quickly and generally appear indifferent to change.

Wernicke's encephalopathy is characterized by

• nystagmus
• ophthalmoplegia
• anisocoria
• ataxia
• sluggish pupillary reflexes
• coma and death if untreated

Physical Examination

Appearance of the Patient

• Lethargic and disturbed consciousness

Eyes

• May have jaundice due to liver damage
• Nystagmus
• Anisocoria
• Sluggish pupilary reflex
• opthalmoplegia

Abdomen

• Organomegaly may be noticed

Neurologic

• Tremors
• Ataxia

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.

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.

References

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