Wernicke encephalopathy vs Beriberi
How to tell Wernicke encephalopathy and Beriberi apart when a board question makes them look alike.
Wernicke is brain triad from thiamine deficiency; beriberi is peripheral nerve or high-output heart failure from thiamine deficiency.
Side by side
Wernicke encephalopathy is thiamine deficiency causing confusion, ataxia, ophthalmoplegia, nystagmus, and mammillary body injury, often in alcoholism or malnutrition.
Beriberi is thiamine deficiency presenting as dry peripheral neuropathy or wet high-output heart failure, edema, and dilated cardiomyopathy.
Thiamine deficiency impairs pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase, branched-chain ketoacid dehydrogenase, and transketolase in vulnerable brain regions.
The same thiamine-dependent energy failure affects peripheral nerves and myocardium, producing neuropathy or high-output cardiac failure.
Triad of confusion, ataxia, ophthalmoplegia, nystagmus, and mammillary body injury support Wernicke encephalopathy.
Peripheral neuropathy supports dry beriberi; edema, tachycardia, cardiomegaly, and high-output failure support wet beriberi.
The trap
Both are B1 deficiency, so the organ system and urgency of thiamine before glucose separate them.
The repair move
For thiamine deficiency, decide whether the question is testing brain, peripheral nerve, or heart; in suspected Wernicke, give thiamine before glucose.
Try a free question
CoreA 48-year-old malnourished man with chronic alcohol use presents with acute confusion, gait ataxia, horizontal nystagmus, and bilateral lateral rectus palsies. MRI shows hyperintensity of the mammillary bodies. Which condition is most likely?
Show answer and explanation
Answer: A. Wernicke encephalopathy. Wernicke encephalopathy is acute thiamine deficiency with the classic triad of confusion, ataxia, and ophthalmoplegia/nystagmus; mammillary body damage is the pathologic hallmark. Treat IMMEDIATELY with IV thiamine before any glucose load.
Why the other choices are tempting
- B. Wet beriberi presents with high-output cardiac failure and edema, not the encephalopathy triad.
- C. Dry beriberi presents with symmetric peripheral neuropathy, not central confusion with ophthalmoplegia.
- D. Korsakoff syndrome is the chronic memory deficit syndrome (confabulation, anterograde and retrograde amnesia) that follows untreated Wernicke.
- E. Hepatic encephalopathy causes asterixis and elevated ammonia without the Wernicke triad and mammillary body MRI changes.
Flashcards
Tap a card to flip it.
What clue supports Wernicke encephalopathy?
Choose Wernicke encephalopathy when the stem gives this pattern: Wernicke encephalopathy is thiamine deficiency causing confusion, ataxia, ophthalmoplegia, nystagmus, and mammillary body injury, often in alcoholism or malnutrition.
What clue supports Beriberi?
Choose Beriberi when the stem gives this contrasting pattern: Beriberi is thiamine deficiency presenting as dry peripheral neuropathy or wet high-output heart failure, edema, and dilated cardiomyopathy.
Quick answers
What is the fastest way to tell Wernicke encephalopathy from Beriberi?
Wernicke is brain triad from thiamine deficiency; beriberi is peripheral nerve or high-output heart failure from thiamine deficiency.
What is the key clue for Wernicke encephalopathy?
Wernicke encephalopathy is thiamine deficiency causing confusion, ataxia, ophthalmoplegia, nystagmus, and mammillary body injury, often in alcoholism or malnutrition.
What is the key clue for Beriberi?
Beriberi is thiamine deficiency presenting as dry peripheral neuropathy or wet high-output heart failure, edema, and dilated cardiomyopathy.
What is the common trap with Wernicke encephalopathy vs Beriberi?
Both are B1 deficiency, so the organ system and urgency of thiamine before glucose separate them.