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Are most sixth nerve palsies really paralytic?
Ayse Gul Altintas1, Hasan Basri Arifoglu, Derya Dal
1Ankara Ataturk Training and Research Hospital, Ankara, Turkey.
Journal of Pediatric Ophthalmology and Strabismus
|August 3, 2010
Summary
Botulinum toxin A injections effectively treat acute sixth nerve palsy by preventing muscle contraction. Surgery for chronic cases corrects deviation, indicating most palsies involve partial paralysis.
Area of Science:
- Ophthalmology
- Neurology
Background:
- Sixth nerve palsy etiology and onset are crucial for treatment planning.
- This study investigates treatment protocols and outcomes for sixth nerve palsies.
Purpose of the Study:
- To evaluate the effectiveness of Botulinum toxin A (BTX) injections for acute sixth nerve palsy.
- To assess surgical outcomes for chronic sixth nerve palsy without transposition procedures.
Main Methods:
- Thirty-four patients with sixth nerve palsy were divided into two groups: acute cases received BTX injections into the medial rectus muscle, while chronic cases underwent horizontal surgery.
- Surgical interventions included medial rectus recession or a combination of medial rectus recession and lateral rectus resection.
Main Results:
- The BTX group (15 patients) showed an 86.6% recovery rate with no residual deviation.
- The surgery group (19 patients) achieved an 85.7% orthotropia rate, with mean deviation decreasing from 35.1 PD to 2.57 PD postoperatively.
Conclusions:
- BTX injection is an effective treatment for acute sixth nerve palsy, preventing medial rectus muscle contraction.
- Surgical correction of chronic sixth nerve palsy suggests that most cases involve partial, not complete, paralysis of the sixth nerve.
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