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Referral and warning signs
When to refer
All patients with suspected Wernicke Encephalopathy require urgent hospital admission (H) for immediate parenteral thiamine administration and supportive care.
Red flags
- Confusion / Altered mental state in an alcoholic or malnourished patient
- Ataxia (unsteady gait)
- Abnormal eye movements (nystagmus, gaze palsy)
- Any component of the triad in an at-risk patient
Signs and symptoms
- Classic Triad (often only 1 or 2 components present):
- 1. Acute Mental Confusion / Encephalopathy: Disorientation, apathy, inattention, drowsiness, potentially progressing to stupor or coma.
- 2. Ataxia: Gait ataxia (unsteady, wide-based gait), limb ataxia.
- 3. Ophthalmoplegia / Nystagmus: Abnormal eye movements including paralysis of gaze (especially lateral rectus palsy - CN VI), nystagmus (horizontal or vertical).
- Other possible signs: Hypotension, hypothermia, peripheral neuropathy symptoms (in chronic thiamine deficiency), memory impairment (may progress to Korsakoff syndrome).
Risk factors
- Chronic alcohol use disorder (most common).
- Severe malnutrition / Starvation.
- Persistent vomiting (hyperemesis gravidarum).
- Post-bariatric surgery.
- Prolonged parenteral nutrition without adequate thiamine.
- Malignancy.
- Chronic dialysis.
- AIDS.
Diagnosis
Clinical assessment
Diagnosis is primarily clinical based on recognizing compatible neurological signs (especially the triad, even if incomplete) in a patient with risk factors (esp. alcoholism, malnutrition). High index of suspicion required. Do not delay treatment while awaiting investigations.
Investigations
- Clinical diagnosis paramount.
- Check Blood Glucose (rule out hypoglycemia).
- Check Electrolytes (esp. Magnesium - needed for thiamine function).
- Thiamine levels (blood) - not readily available acutely, low levels confirm deficiency but normal level doesn't rule out Wernicke's.
- MRI Brain (if available): May show characteristic changes (hyperintensities in mammillary bodies, thalamus, periaqueductal gray matter) but often normal initially.
- Response to thiamine administration supports the diagnosis.
Diagnostic criteria
Clinical diagnosis based on ≥2 of the Caine criteria: 1. Dietary deficiencies, 2. Oculomotor abnormalities, 3. Cerebellar dysfunction (ataxia), 4. Altered mental state or mild memory impairment.
Management
Non-pharmacological management
- Supportive care (Airway, Breathing, Circulation).
- Nutritional support.
- Management of underlying cause (e.g., alcohol cessation, treatment of hyperemesis).
Pharmacological treatment
- Immediate High-Dose Parenteral Thiamine: CRITICAL treatment. Give BEFORE or concurrently with any glucose administration.
- - Treatment Dose: Thiamine 100-500 mg IV or IM, administered every 8 hours (TID) for 3-5 days, or until clinical improvement.
- - Followed by Thiamine 100 mg daily PO or IV/IM until patient is nutritionally replete.
- Correct electrolyte abnormalities, especially magnesium deficiency.
- Manage alcohol withdrawal concurrently if present (see MH012).
Monitoring
Monitor neurological status closely (mental state, eye movements, ataxia). Monitor response to thiamine. Monitor nutritional intake and electrolytes.
Complications
- Progression to Korsakoff Syndrome: Severe, often permanent anterograde and retrograde amnesia, confabulation, apathy (occurs if Wernicke's not treated promptly/adequately).
- Persistent ataxia.
- Persistent ophthalmoplegia.
- Coma.
- Death.
Prevention
- Routine thiamine supplementation (oral or parenteral) for all patients at risk (chronic alcohol use, malnutrition, hyperemesis, bariatric surgery, prolonged IV fluids/feeding).
- ALWAYS give thiamine before or with glucose administration in at-risk individuals.
- Addressing alcohol use disorder.
Patient education
- Explain the condition is due to vitamin (thiamine) deficiency, often related to alcohol/malnutrition.
- Stress the importance of immediate and ongoing thiamine treatment.
- Educate on the need for alcohol cessation and nutritional rehabilitation.
- Explain the risk of permanent memory problems (Korsakoff) if untreated.
Uganda-specific notes
Wernicke's is likely under-diagnosed, especially in patients with chronic alcohol use or malnutrition. Always give thiamine before glucose to at-risk patients presenting with altered mental status or receiving IV fluids. Parenteral thiamine may not always be readily available but is crucial.
References
- Uganda Clinical Guidelines (UCG) 2023
Chapter 1, Section 1.3.12.2 (Clinical features and Management)
- Uganda Clinical Guidelines (UCG) 2023
Chapter 9, Section 9.2.5 (Mentions Wernicke as complication)