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Long-term results: botulinum for sixth nerve palsy.
1Department of Ophthalmology, University of Medicine and Dentistry of New Jersey, New Jersey Medical School, Newark.
Summary
Botulinum toxin injections effectively treated sixth nerve palsies in eight patients, resolving esotropia and diplopia in most cases. This treatment offers a promising option for managing complex strabismus, improving ocular alignment and patient outcomes.
Area of Science:
- Ophthalmology
- Neurology
- Botulinum Toxin Research
Background:
- Sixth nerve palsy can result in significant esotropia and diplopia.
- Intracranial pathologies and vascular lesions are common causes of sixth nerve palsy.
- Management of sixth nerve palsy often requires addressing the underlying cause and managing resulting strabismus.
Purpose of the Study:
- To evaluate the efficacy of botulinum toxin chemodenervation of the medial rectus muscle in patients with sixth nerve palsy and esotropia.
- To assess the impact of botulinum toxin on ocular alignment, diplopia, and eye movement recovery.
Main Methods:
- Eight patients with intracranial pathologies causing sixth nerve palsy and esotropia were treated.
- Botulinum toxin was injected into the antagonist medial rectus muscle.
- Patients were followed for a mean of 20.6 months to assess outcomes.
Main Results:
- Seven out of eight patients became diplopia-free with excellent eye rotations.
- Five patients achieved complete resolution of esotropia and diplopia with near-complete abduction recovery.
- One patient required additional surgical intervention, and one experienced temporary induced vertical strabismus.
Conclusions:
- Botulinum toxin chemodenervation is a viable and effective treatment for esotropia secondary to sixth nerve palsy.
- The treatment can lead to significant functional improvement, reducing diplopia and improving ocular alignment.
- Further research may explore optimal timing and patient selection for botulinum toxin therapy in sixth nerve palsy.