Question

A patient who has undergone intestinal resection develops progressive ataxia and loss of proprioception. Which vitamin deficiency most likely explains these neurological symptoms?

• A. Vitamin A
• B. Vitamin D
• C. Vitamin E
• D. Vitamin K

Hint:

When evaluating a patient with posterior column signs (loss of vibration/proprioception) and ataxia, the primary differential includes Vitamin B12 deficiency, Vitamin E deficiency, Copper deficiency, and neurosyphilis (Tabes dorsalis).

Answer 1

The Correct Option is C

Concept:
Extensive intestinal resection (especially involving the terminal ileum) or conditions causing severe fat malabsorption (like cystic fibrosis or chronic cholestasis) lead to the depletion of fat-soluble vitamins (A, D, E, K).
The clinical challenge is identifying which specific fat-soluble vitamin deficiency is responsible for a distinct neurological syndrome featuring progressive ataxia and sensory deficits.
Explanation:
• Vitamin E (specifically alpha-tocopherol) serves as a critical, potent lipid-soluble antioxidant in the body.

• It protects cell membranes, particularly the highly lipid-rich myelin sheaths of neurons in the central and peripheral nervous systems, from oxidative damage by free radicals.

• Severe and prolonged Vitamin E deficiency leads to progressive demyelination and axonal degeneration, specifically targeting the spinocerebellar tracts, dorsal columns, and peripheral nerves.

• Clinically, this manifests as a profound spinocerebellar syndrome. Symptoms include progressive cerebellar ataxia, loss of proprioception and vibration sense (due to dorsal column involvement), absent deep tendon reflexes, and muscle weakness.

• This neurological presentation is virtually indistinguishable clinically from Friedreich's ataxia or severe Vitamin B12 deficiency (Subacute Combined Degeneration).

• Option (A), Vitamin A deficiency, primarily causes ocular issues (night blindness, xerophthalmia) and immune dysfunction.

• Option (B), Vitamin D deficiency, causes bone disorders (osteomalacia/rickets) and hypocalcemia.

• Option (D), Vitamin K deficiency, results in a coagulopathy (prolonged PT) due to impaired synthesis of clotting factors II, VII, IX, and X.
Final answer:
Vitamin E deficiency is uniquely responsible for the progressive neurodegenerative syndrome of ataxia and proprioceptive loss among the fat-soluble vitamins.