Wernicke encephalopathy vs Korsakoff syndrome
How to tell Wernicke encephalopathy and Korsakoff syndrome apart when a board question makes them look alike.
Wernicke is acute confusion-eye-ataxia emergency; Korsakoff is chronic amnesia-confabulation sequela.
Side by side
Acute thiamine deficiency causing confusion, ophthalmoplegia or nystagmus, and ataxia, often in alcohol use disorder, malnutrition, hyperemesis, or bariatric surgery.
Chronic amnestic syndrome after untreated or recurrent thiamine deficiency with anterograde amnesia, retrograde memory gaps, and confabulation.
Thiamine deficiency impairs glucose metabolism in vulnerable brain regions such as mammillary bodies and periaqueductal gray.
Persistent injury to memory circuits, especially mammillary bodies and diencephalic structures, produces chronic memory impairment.
Acute confusion, ataxia, ocular findings, risk factors, and MRI mammillary body changes support Wernicke encephalopathy; treat with thiamine before glucose.
Confabulation and severe anterograde amnesia after Wernicke episodes support Korsakoff syndrome.
The trap
Both are thiamine-deficiency syndromes, so acute reversible emergency versus chronic memory syndrome is the key distinction.
Watch it explained
Test it nowThe repair move
For thiamine deficiency, give thiamine before glucose and distinguish acute encephalopathy from chronic amnesia.
Try a free question
CoreA malnourished patient with alcohol use disorder presents with acute confusion, ataxia, and nystagmus. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Wernicke encephalopathy. Acute confusion, ocular findings, and ataxia in thiamine deficiency risk supports Wernicke encephalopathy.
Why the other choices are tempting
- B. Korsakoff syndrome is chronic amnesia and confabulation.
- C. Alzheimer disease is gradual memory-first dementia.
- D. Hepatic encephalopathy requires liver failure clues such as asterixis or hyperammonemia.
- E. CJD causes rapidly progressive dementia with myoclonus.
Flashcards
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What triad points to Wernicke encephalopathy?
Confusion, ophthalmoplegia or nystagmus, and ataxia point to Wernicke encephalopathy.
What treatment sequence matters in Wernicke encephalopathy?
Give thiamine before glucose in suspected Wernicke encephalopathy.
Quick answers
What is the fastest way to tell Wernicke encephalopathy from Korsakoff syndrome?
Wernicke is acute confusion-eye-ataxia emergency; Korsakoff is chronic amnesia-confabulation sequela.
What is the key clue for Wernicke encephalopathy?
Acute thiamine deficiency causing confusion, ophthalmoplegia or nystagmus, and ataxia, often in alcohol use disorder, malnutrition, hyperemesis, or bariatric surgery.
What is the key clue for Korsakoff syndrome?
Chronic amnestic syndrome after untreated or recurrent thiamine deficiency with anterograde amnesia, retrograde memory gaps, and confabulation.
What is the common trap with Wernicke encephalopathy vs Korsakoff syndrome?
Both are thiamine-deficiency syndromes, so acute reversible emergency versus chronic memory syndrome is the key distinction.