Alcohol withdrawal and delirium tremens vs Wernicke encephalopathy
How to tell Alcohol withdrawal and delirium tremens and Wernicke encephalopathy apart when a board question makes them look alike.
Withdrawal is autonomic hyperexcitable after alcohol cessation; DT is withdrawal plus delirium; Wernicke is thiamine-deficiency confusion with eye findings and ataxia.
Side by side
Alcohol withdrawal begins after reduction/cessation with tremor, anxiety, insomnia, autonomic hyperactivity, seizures, and in severe cases delirium tremens with fever, agitation, hallucinations, disorientation, hypertension, and tachycardia.
Wernicke encephalopathy is thiamine deficiency with confusion, ophthalmoplegia or nystagmus, and ataxia, classically in alcohol use disorder or malnutrition.
Chronic alcohol enhances GABA and inhibits NMDA; withdrawal creates CNS hyperexcitability and autonomic overdrive.
Thiamine deficiency impairs cerebral energy metabolism, injuring mammillary bodies and periaqueductal/medial thalamic regions.
Tremor, diaphoresis, tachycardia, hypertension, hallucinosis, seizures 6-48 hours, and delirium tremens around 48-96 hours support withdrawal.
Ataxia, ophthalmoplegia, nystagmus, confusion, malnutrition, low thiamine risk, and improvement with thiamine support Wernicke encephalopathy.
The trap
Confusion in alcohol use is not always withdrawal; ataxia and ophthalmoplegia should trigger thiamine before glucose.
The repair move
For alcohol-related confusion, time the last drink and look for autonomic overdrive versus eye/ataxia signs.
Try a free question
CoreA patient with heavy alcohol use stops drinking and 3 days later has fever, agitation, hypertension, tachycardia, diaphoresis, hallucinations, and disorientation. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Delirium tremens. Severe alcohol withdrawal with delirium, hallucinations, autonomic instability, and agitation supports delirium tremens.
Why the other choices are tempting
- B. Wernicke encephalopathy centers on thiamine-deficiency confusion with ophthalmoplegia/nystagmus and ataxia.
- C. Opioid withdrawal causes mydriasis, diarrhea, piloerection, and lacrimation rather than DT pattern.
- D. Serotonin syndrome has clonus and hyperreflexia after serotonergic exposure.
- E. Hepatic encephalopathy has liver failure clues and asterixis.
Flashcards
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What physiology causes alcohol withdrawal?
Loss of alcohol after chronic GABA enhancement and NMDA inhibition causes CNS hyperexcitability.
What severe withdrawal syndrome includes delirium and autonomic instability?
Delirium tremens includes delirium, hallucinations, fever, hypertension, tachycardia, and agitation.
Quick answers
What is the fastest way to tell Alcohol withdrawal and delirium tremens from Wernicke encephalopathy?
Withdrawal is autonomic hyperexcitable after alcohol cessation; DT is withdrawal plus delirium; Wernicke is thiamine-deficiency confusion with eye findings and ataxia.
What is the key clue for Alcohol withdrawal and delirium tremens?
Alcohol withdrawal begins after reduction/cessation with tremor, anxiety, insomnia, autonomic hyperactivity, seizures, and in severe cases delirium tremens with fever, agitation, hallucinations, disorientation, hypertension, and tachycardia.
What is the key clue for Wernicke encephalopathy?
Wernicke encephalopathy is thiamine deficiency with confusion, ophthalmoplegia or nystagmus, and ataxia, classically in alcohol use disorder or malnutrition.
What is the common trap with Alcohol withdrawal and delirium tremens vs Wernicke encephalopathy?
Confusion in alcohol use is not always withdrawal; ataxia and ophthalmoplegia should trigger thiamine before glucose.