wernicke’s encephalopathy
TRANSCRIPT
Wernicke’s Encephalopathy
Shyala ChandYear 4
Introduction Acute neurological disorder induced by
Thiamine deficiency(Vitamin B1) More prevalent in males (1.7: 1) Average onset age is 50 years (range: 30-70 years) First described in 1881 by Dr. Carl
Wernicke
Cont. Rate has been found to be significantly
higher in specific populations, i.e., homeless people, older people (especially those living alone or in isolation), and psychiatric inpatients, where alcohol use and poor nutritional states predominate.
Prevalence at autopsy exceeds clinical detection.
Thiamine (Vitamin B1) Water soluble vitamin absorbed from the
gut. Serves as a cofactor to several enzymes
that are responsible for lipid and carbohydrate metabolism, production of amino acids and production of glucose derived neurotransmitters.
Also have a role in axonal conduction esp. of acetylcholinergic and serotoninergic neurons.
Cont. Cellular impairment and injury occur
within 2-3 weeks of decreased intake and thiamine depletion.
Acute thiamine deficiency leads to mitochondrial dysfunction resulting in oxidative toxicity in areas of brain.
Causes of Thiamine Deficiency
Chronic alcoholism Malnutrition or prolonged starvation Hyperemesis Gravidarum Bariatric surgery Gastric malignancy (inflammatory
bowel disease) Intestinal obstruction (abscess) Thyrotoxicosis
Cont. Iatrogenic (IV glucose without thiamine
supplement or chronic hemodialysis) Systemic diseases (AIDS, disseminated
TB) Thiamine deficient formula/
breastfeeding by mothers with inadequate thiamine intake
Infection( precipitating factor)- pneumonia, meningitis
Clinical Presentation Clinical Triad - ocular abnormalities
(29%) - encephalopathy (82%) - ataxia (23%) Occurs in 1/3 of cases.
Ocular Abnormalities Hallmark of WE Nystagmus, bilateral rectal
palsies and conjugate gaze palsies (involvement of oculomotor, abducens and vestibular nuclei)
Less common manifestations are pupillary abnormalities, ptosis, sctomata and anisocoria
Encephalopathy Global confusion state, disinterest,
inattentiveness or agitation. Most common presentation is mental
state changes. Stupor and coma observed in severe
cases
Ataxia Due to polyneuropathy, cerebellar
damage and vestibular paresis. Wide based stance Slow and uncertain short stepped gait. Inability to walk without support in
severe cases.
Other symptoms Peripheral neuropathy (weakness, foot
drop & decreased proprioception) GI symptoms (nausea, vomiting, lactic
acidosis) Hypotension Hypothermia Memory disturbances
Anatomical Changes Acute symmetrical lesions in thalamus,
mamillary bodies, tectal plate, periaqueductal area, floor of 4th ventricle (includes oculomotor and vestibular nuclei and cerebellar vermis)
Lesions are in form of vascular congestion, microglial proliferation and petechial hemorrhages.
Wernicke- Korsakoff Syndrome (WKS)
Chronic complication of WE Occurs in 2/3 of patients with untreated
WE Only 25% of patients fully recover. Lesions are similar to WE expect they
are not hemorrhagic. Results in cerebellar atrophy
(irreversible change).
Characteristics: Anterograde amnesia (inability to form
new memories) Retrograde amnesia ( inability to recall
past events) Confabulations
Diagnosis Detailed patient history Physical and neurological examination Laboratory evaluation CBC (rule out infections, severe
anemia) Serum thiamine levels Erythrocyte transketolase levels Serum glucose levels Toxic drug screening
Cont. Lumbar puncture (rule out CNS
infections) Imaging MRI (fluid attenuated inversion
recovery {FLAIR} images) CT ( not specific) EEG ( rule out non- convulsive status
epilepticus)
MRI scan of before and after Thiamine administration
Differential Diagnosis Hepatic encephalopathy Hypoglycemia Anorexia nervosa Alcohol related psychosis Withdrawal syndromes Delirium tremens
Treatment Considered a medical emergency Emergency care : Parenteral Thiamine
(multiple daily doses – 500mg/dose) Alcohol withdrawal In case of WKS, use of oral Thiamine to
prevent further complications. Parenteral magnesium sulfate in case of
hypomagnesaemia Balanced diet with high thiamine containing
foods.
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