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Mixed demyelinating and axonal polyneuropathy

Last edited: 4/15/2026

Overview

Mixed demyelinating and axonal polyneuropathy refers to a neuropathy syndrome characterized by concurrent involvement of both myelin sheaths and axons. This condition can manifest acutely in the context of severe nutritional deficiencies, particularly among individuals with alcoholism, post-bariatric surgery, or anorexia nervosa 1.

Diagnosis

  • Clinical Features: Severe, painful sensory or sensorimotor polyneuropathy developing over 2-12 weeks, sensory ataxia, areflexia, muscle weakness, weight loss, and prolonged vomiting 1.
  • Laboratory Tests: Low serum vitamin B6 and thiamine levels are common 1.
  • Electrodiagnostic Studies: Electrodiagnostic findings indicative of axonal damage, with sensory conduction slowing or block more frequently observed 1.
  • CSF Analysis: Typically normal cerebrospinal fluid protein levels 1.

    • Management

  • Nutritional Support: Weight gain and targeted vitamin supplementation, particularly thiamine and vitamin B6, are crucial 1.
  • Supplementation: Specific dosing details not provided; individualized based on deficiencies identified 1.
  • Symptomatic Treatment: Pain management strategies as needed for neuropathic pain 1.

    • Special Populations

  • Alcoholism and Bariatric Surgery: Patients with a history of alcohol abuse or recent bariatric surgery are at higher risk and require vigilant nutritional monitoring 1.
  • Nutritional Deficiencies: Particular attention to micronutrient deficiencies in individuals with anorexia nervosa or restrictive diets 1.

    • Key Recommendations

  • Evaluate and correct thiamine and vitamin B6 deficiencies in patients presenting with acute axonal polyneuropathy associated with weight loss or vomiting 1 (Evidence: Strong).
  • Initiate comprehensive nutritional support, focusing on weight restoration, alongside targeted vitamin supplementation for recovery 1 (Evidence: Strong).
  • Consider electrodiagnostic studies to confirm axonal damage in suspected cases of mixed demyelinating and axonal polyneuropathy 1 (Evidence: Moderate).

    • References

    1 Hamel J, Logigian EL. Acute nutritional axonal neuropathy. Muscle & nerve 2018. link

    Original source

    1. [1]
      Acute nutritional axonal neuropathy. — Hamel J, Logigian EL Muscle & nerve (2018)
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