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Ocular ethambutol toxicity: is it reversible?

A Kumar1, S Sandramouli, L Verma

  • 1Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, Ansari Nagar, New Delhi.

Journal of Clinical Neuro-Ophthalmology
|March 1, 1993
PubMed
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Ethambutol-induced optic neuropathy may not be reversible, with many patients experiencing permanent vision loss. Researchers suggest discontinuing ethambutol in tuberculosis treatment due to poor visual recovery outcomes.

Area of Science:

  • Ophthalmology
  • Pharmacology
  • Infectious Diseases

Background:

  • Ethambutol is a key drug in tuberculosis treatment.
  • Ocular toxicity from ethambutol is typically considered reversible upon drug cessation.

Purpose of the Study:

  • To evaluate the visual recovery outcomes in patients with severe ethambutol toxicity.
  • To assess the long-term impact of ethambutol-induced optic neuropathy.

Main Methods:

  • A series of seven consecutive patients with severe visual deficit due to ethambutol toxicity were monitored.
  • Follow-up included visual acuity assessment and fluorescein angiography.
  • Visually evoked potential was considered for monitoring.

Main Results:

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  • Only 42.2% of patients achieved significant visual recovery (better than 20/200) after an average of 8.3 months.
  • 42.2% of patients progressed to optic atrophy, indicating permanent visual damage.
  • No identifiable risk factors predicted the poor visual outcomes.

Conclusions:

  • Ethambutol discontinuation is recommended due to a high incidence of irreversible visual impairment.
  • The study highlights the potential for permanent vision loss despite early drug withdrawal.
  • Visually evoked potential may aid in monitoring patients at risk.