Neurology · MU Sofia

56. Neurological complications of acute and chronic alcoholism

Covers the neurological effects of acute and chronic alcohol use, beginning with the mechanisms of harm (direct toxicity, thiamine deficiency, liver dysfunction, metabolic change) and then staging acute intoxication. It goes on to withdrawal and delirium tremens, Wernicke encephalopathy with its classic triad, Korsakoff syndrome, cerebellar degeneration, polyneuropathy, myopathy and hepatic encephalopathy. A closing differential diagnosis compares Wernicke with stroke, alcoholic with diabetic neuropathy, and delirium tremens with psychosis.

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Topic 56 of 88 in the MU Sofia syllabus for Neurology (Medicine, Year 4). The free AceMed note covers it in 1 section, about 262 words (2 min of reading), with 15 flashcards.

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  1. Neurological complications of acute and chronic alcoholism

Neurological complications of acute and chronic alcoholism

Definition

Alcohol can cause acute and chronic neurological disorders through:

  • Direct neurotoxicity
  • Nutritional deficiencies (especially vitamin B1/thiamine deficiency)
  • Liver dysfunction
  • Metabolic disturbances

A. ACUTE ALCOHOLISM

1.Acute Alcohol Intoxication

Clinical Features: Depends on blood alcohol level.

Stages

  • Early Stage: Euphoria. Impaired judgment. Reduced attention. Disinhibition
  • Moderate Stage: Dysarthria. Ataxia. Nystagmus. Incoordination
  • Severe Stage: Stupor. Coma. Respiratory depression. Death

Neurological Signs: Gait instability. Slurred speech. Impaired reflexes. Altered consciousness

B. CHRONIC ALCOHOLISM

1.Alcohol Withdrawal Syndrome

Features: Occurs after cessation of alcohol.. Tremor ("alcoholic tremor"). Anxiety. Sweating. Tachycardia. Insomnia

Severe Form: Delirium Tremens

  • Clinical Features: Confusion. Agitation. Hallucinations (visual common). Fever. Tremor. Autonomic hyperactivity

2.Wernicke Encephalopathy alcoholics commonly develop thiamine deficiency through several mechanisms

Cause: Thiamine (Vitamin B1) deficiency

Classic Triad: Confusion. Ataxia. Ophthalmoplegia/Nystagmus

Pathology

  • Lesions around: Mammillary bodies. Thalamus. Periaqueductal region

Treatment: Immediate thiamine before glucose

3.Korsakoff Syndrome: Often follows Wernicke encephalopathy

Clinical Features: Severe anterograde amnesia. Retrograde amnesia. Confabulation. Learning impairment

Characteristic: Patient fills memory gaps with invented stories.

4.Alcoholic Cerebellar Degeneration

Mainly affects: Anterior cerebellar vermis

Features: Gait ataxia. Wide-based gait. Postural instability. Upper limb coordination often relatively preserved

5.Alcoholic Polyneuropathy

Cause: Direct toxicity + vitamin deficiency

Features: Distal numbness. Burning feet. Distal weakness. Reduced ankle reflexes

Pattern: “Stocking-glove neuropathy”

6.Alcoholic Myopathy

Acute form: Muscle pain. Muscle swelling

Chronic form: Proximal muscle weakness. Muscle wasting

7.Hepatic Encephalopathy: Due to chronic liver disease

Features: Confusion. Personality changes. Drowsiness. Asterixis (flapping tremor). Coma

Differential Diagnosis

  • Wernicke vs Stroke: Bilateral signs. Nutritional deficiency history
  • Alcoholic Neuropathy vs Diabetic Neuropathy: Similar distal sensory loss. Alcohol history important
  • Delirium Tremens vs Psychosis: Autonomic symptoms and withdrawal history

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