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Metronidazole neurotoxicity: sequential neuroaxis involvement.

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Metronidazole toxicity can cause neurological issues like neuropathy and encephalopathy. This case highlights a patient experiencing severe symptoms after prolonged metronidazole treatment, emphasizing the need for careful monitoring.

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Area of Science:

  • Neurology
  • Toxicology
  • Infectious Diseases

Background:

  • Metronidazole is an antibiotic commonly used to treat anaerobic bacterial and protozoal infections.
  • Neurological side effects, including peripheral neuropathy and encephalopathy, are known but rare complications of metronidazole therapy.
  • Prolonged treatment courses may increase the risk of developing these adverse neurological events.

Observation:

  • A 67-year-old male presented with a 3-week history of progressive, painful paresthesias in all four limbs.
  • The patient had received 10 weeks of metronidazole and cephalosporin for a hepatic abscess.
  • Symptoms progressed to include dysarthria and limb ataxia, with MRI revealing abnormalities in the corpus callosum splenium and dentate nuclei.

Findings:

  • The patient developed autonomic dysfunction (diaphoresis, blood pressure fluctuations) shortly after brain imaging.
  • These autonomic symptoms resolved rapidly after metronidazole discontinuation.
  • While speech function improved within a week, persistent burning paresthesias were noted 6 months post-discharge.

Implications:

  • This case underscores the potential for severe and persistent neurological toxicity from prolonged metronidazole use.
  • It highlights the importance of recognizing and monitoring for both central and peripheral nervous system effects.
  • Early detection and discontinuation of the offending agent are crucial for managing metronidazole-induced neurotoxicity.