Neurology · MU Sofia

84. Neurological disorders in internal medicine

Covers how systemic diseases such as diabetes, thyroid, renal and liver disorders, electrolyte imbalances, vitamin deficiencies, autoimmune, haematological and cardiac conditions produce neurological symptoms. It goes through each group in turn, listing manifestations and examination findings, and includes a Wernicke triad and a short diagnostic approach and treatment principles.

Inside: 2 sections · 16 flashcards · 2 min

Topic 84 of 88 in the MU Sofia syllabus for Neurology (Medicine, Year 4). The free AceMed note covers it in 2 sections, about 354 words (2 min of reading), with 16 flashcards.

In this note

  1. Neurological disorders in internal medicine
  2. Diagnostic Approach:

Neurological disorders in internal medicine

Definition: Many systemic (internal medicine) diseases affect the nervous system, causing neurological symptoms due to metabolic, endocrine, vascular, toxic, autoimmune, infectious, or organ failure-related mechanisms.

1. Neurological Disorders in Endocrine Diseases

A.Diabetes Mellitus (Most Common)

  • Neurological Manifestations: Distal symmetric polyneuropathy. Autonomic neuropathy. Cranial neuropathies. Mononeuropathies. Increased risk of stroke
  • Examination: Distal sensory loss. Reduced ankle reflexes. Autonomic dysfunction

B.Thyroid Disorders

  • Hypothyroidism: Polyneuropathy. Myopathy. Carpal tunnel syndrome. Cognitive slowing
  • Hyperthyroidism: Tremor. Myopathy. Periodic paralysis

2. Neurological Disorders in Renal Disease

A.Uremic Encephalopathy

  • Clinical Features: Confusion. Drowsiness. Seizures. Coma

B.Uremic Neuropathy: Distal sensorimotor polyneuropathy

3. Neurological Disorders in Liver Disease

Hepatic Encephalopathy It is caused by the liver's inability to filter toxins from the bloodstream, which then build up and affect the brain.

  • Clinical Features: Confusion. Personality changes. Asterixis ("flapping tremor"). Coma
  • Pathogenesis: Hyperammonemia

4. Neurological Disorders in Electrolyte Disturbances

A.Hyponatremia: Headache. Confusion. Seizures. Coma

B.Hypernatremia: Irritability. Altered consciousness

C.Hypocalcemia: Tetany. Muscle cramps. Seizures

D.Hypercalcemia: Weakness. Confusion

5. Vitamin Deficiency Disorders

A.Vitamin B1 (Thiamine) Deficiency

  • Wernicke Encephalopathy
  • Triad: Confusion.Ataxia. Ophthalmoplegia
  • Korsakoff Syndrome: Severe memory impairment. Confabulation

B.Vitamin B12 Deficiency: Peripheral neuropathy. Subacute combined degeneration. Sensory ataxia

6. Neurological Disorders in Autoimmune Diseases

A.Systemic Lupus Erythematosus (SLE)

  • Manifestations: Stroke. Seizures. Cognitive dysfunction. Neuropathy.

B.Vasculitis: Mononeuritis multiplex. Stroke

7. Neurological Disorders in Hematologic Diseases

A.Anemia: Fatigue. Cognitive impairment

B.Polycythemia: Stroke risk.Headache

C.Hypercoagulable States: Cerebral venous thrombosis. Ischemic stroke

8. Neurological Disorders in Cardiac Diseases

A.Cardioembolic Stroke occurs when a blood clot or debris forms in the heart, breaks, and travels through the bloodstream to block a blood vessel in the brain

  • Causes: Atrial fibrillation. Valvular disease. Endocarditis

B.Hypoxic Brain Injury: : Causes Cardiac arrest. Severe heart failure occurs when the brain receives insufficient oxygen to function properly

9. Toxic and Metabolic Encephalopathies

  • Causes: Alcohol. Drugs. Hepatic failure. Renal failure
  • Clinical Features: Altered consciousness. Delirium
  • Seizures.

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