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Wernicke Encephalopathy

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In one line

·Wernicke encephalopathy happens when the body runs out of thiamine (vitamin B1), usually from heavy alcohol use, poor eating, repeated vomiting, stomach surgery, or refeeding after starvation—and giving sugar without thiamine first makes it worse.

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Normal physiology

·Thiamine (vitamin B1) is the essential helper molecule that lets every cell—especially brain cells—turn sugar (glucose) into usable energy (ATP). The brain runs on a tight energy budget and has almost no backup fuel, so it depends on a steady thiamine supply every single day.

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What goes wrong

·Wernicke encephalopathy happens when thiamine runs out and the brain cannot make energy from glucose anymore. The break is not in one organ—it is in every cell's power plant. The brain regions that burn the most energy (the mammillary bodies and thalamus for memory, the cerebellum and brainstem for balance and eye movement) die first.

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Hallmark signs

·Confusion or trouble thinking clearly
·Unsteady walk or trouble balancing (ataxia)
·Abnormal eye movements — eyes may drift, shake, or not move together (nystagmus or ophthalmoplegia)
·Double vision
·Droopy eyelid (ptosis)
·Low blood pressure when standing (orthostatic low blood pressure (hypotension)) or fast heart rate
·Low body temperature (hypothermia)
·Memory loss, especially for new events, and tendency to make up stories to fill gaps (confabulation)

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Red flags · escalate now

·Confusion that gets worse quickly — brain swelling or bleeding may be starting
·Eyes that cannot move in all directions or pupils that are unequal — pressure on brainstem nerves is a medical emergency
·Body temperature below 95 °F (35 °C) or very slow heart rate — the brain's automatic controls are failing and the person may collapse
·Seizures or sudden loss of consciousness — the brain is in crisis and needs thiamine and support immediately
·Signs of bleeding in the brain (severe headache, vomiting, neck stiffness, vision changes) — rare but life-threatening complication of Wernicke encephalopathy

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Workup

·Serum thiamine level (whole blood or plasma)
·Red blood cell transketolase activity (functional thiamine assay)
·Serum magnesium
·Brain MRI with FLAIR and diffusion-weighted imaging (DWI)
·Serum glucose (or fingerstick blood sugar)
·Liver function tests (AST, ALT, GGT, bilirubin)
·Complete blood count (CBC) with mean corpuscular volume (MCV)

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Treatment

·IV thiamine 500 mg three times daily for 2–3 days, then 250 mg daily for 3–5 days, then 100 mg by mouth daily
·IV magnesium sulfate 2 grams over 15–30 minutes, then 1–2 grams daily while giving thiamine
·Do NOT give IV dextrose (sugar water) or oral glucose before thiamine is on board
·Treat alcohol withdrawal with benzodiazepines (lorazepam 1–2 mg IV every 6 hours or diazepam 5–10 mg IV every 6 hours, adjusted to CIWA score) and address the underlying alcohol use disorder with counseling and medication-assisted treatment
·Give balanced nutrition with thiamine 100 mg by mouth daily, plus B-complex vitamins (folate 1 mg, B12 1000 mcg, B6 50 mg), plus regular meals with adequate carbohydrate, protein, and fat
·Monitor core body temperature, eye movements (nystagmus, gaze palsy), mental status (orientation, memory), and gait every 4–6 hours during the first 2–3 days
·Physical and occupational therapy starting in the hospital and continuing after discharge

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NCLEX trap

·Stop. In someone who drinks a lot of alcohol or has not eaten well for weeks, you MUST give thiamine (vitamin B1) BEFORE you give sugar. If you give sugar without thiamine, the brain tries to burn the sugar for energy but can't do it right — because thiamine is the key that unlocks the sugar-burning pathway. Without it, the brain cells build up toxic leftovers and die faster. This makes Wernicke encephalopathy worse and can cause permanent brain damage. Safety rule: thiamine first, sugar second in anyone at risk.
·Weak legs and tingling can be the start of Wernicke encephalopathy. The same thiamine shortage that hurts the brain also hurts the long nerves in the legs. Always ask: Do they drink a lot of alcohol? Do they eat well, or have they been living on snacks and no real meals? Did they have weight-loss surgery or stomach surgery? Did they throw up for days or weeks? These are the upstream breaks that drain thiamine out of the body.
·Glucose without thiamine can trigger Wernicke encephalopathy or make it shoot from hidden to obvious in minutes. If the patient is at risk — alcohol use, poor diet, recent surgery, long vomiting — the confusion might be Wernicke encephalopathy waking up because of the sugar load. Give IV thiamine now, before you do a head CT or wait for other tests.
·Jerky or bouncing eye movements (called involuntary eye jerking (nystagmus)) are a red flag for Wernicke encephalopathy. This is a brain problem, not an eye problem. The brain stem areas that control smooth eye movement — the abducens nucleus and the oculomotor nucleus — are starving without thiamine. Look for confusion and trouble walking too. If you see two or all three of the classic triad (confusion, eye changes, walking problems), give IV thiamine immediately. Do not wait for more tests.
·Low body temperature (hypothermia) is part of Wernicke encephalopathy, not just from cold weather. The hypothalamus (the brain's thermostat, deep in the center of the brain) needs thiamine to work right. When it is starving, body temperature drops even indoors. Ask: Does this patient drink alcohol? Have they eaten real meals, or just bits of food? Do they have the other signs — confusion, odd eye movements, trouble walking? If yes, this is Wernicke encephalopathy. Warming helps, but IV thiamine is the real fix.
·Wernicke encephalopathy needs longer, higher-dose treatment than most vitamin shortages. Current guidelines say: give IV thiamine 500 mg three times a day for at least 2–3 days, then 250 mg once a day for another 3–5 days, then switch to oral thiamine 100 mg every day for weeks to months. Also give magnesium, because without magnesium, thiamine cannot get into cells and work. If you stop too soon, the brain can get worse again, and memory damage (Korsakoff syndrome) can become permanent.

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