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Wernicke-Korsakoff syndrome
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| Wernicke-Korsakoff syndrome |
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Definition:
Wernicke-Korsakoff syndrome is a brain disorder involving loss of specific brain functions caused by a thiamine deficiency. Alternative Names:
Korsakoff psychosis; Alcoholic encephalopathy; Encephalopathy - alcoholic; Wernicke's disease Text Continues Below
Causes, incidence, and risk factors:
The syndrome is actually a spectrum, including two separate sets of symptoms, one of which tends to start when the other subsides. Wernicke's encephalopathy involves damage to multiple nerves in both the central nervous system (brain and spinal cord) and the peripheral nervous system (the rest of the body). It may also include symptoms caused by alcohol withdrawal. The cause is generally attributed to malnutrition, especially lack of vitamin B1 (thiamine), which commonly accompanies habitual alcohol use or alcoholism. Heavy alcohol use interferes with the metabolism of thiamine, so even in the unusual cases where alcoholics are eating a balanced diet while drinking heavily, the metabolic problem persists because most of the thiamine is not absorbed.
Korsakoff syndrome, or Korsakoff psychosis, tends to develop as Wernicke's symptoms diminish. It involves impairment of memory out of proportion to problems with other cognitive functions. Patients often attempt to hide their poor memory by confabulating. The patient will create detailed, believable stories about experiences or situations to cover gaps in memory. This is not usually a deliberate attempt to deceive because the patient often believes what he is saying to be true. It can occur whether or not the thiamine deficiency was related to alcoholism and with other types of brain damage.
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