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Botulinum toxin as an adjunct to monocular recession-resection surgery for large-angle sensory strabismus.

PURPOSE: To evaluate the result of using intraoperative botulinum toxin A (BTA) as an adjunct to monocular recession-resection surgery in the management of large-angle sensory strabismus.

METHODS: The medical records of patients diagnosed with sensory strabismus with constant large-angle strabismus were reviewed retrospectively to identify those who underwent monocular recession-resection surgery combined with 5 units of BTA injection into the recessed muscle of the nonfixating eye. Surgical outcome was considered successful if the final deviation was within the range of 0Δ -10Δ .

RESULTS: A total of 13 patients (mean age, 31.04 ± 18.5 years) were included, 8 with exotropia and 5 with esotropia. The mean follow-up period was 52.77 ± 10.9 months. The mean preoperative deviation was 66Δ ± 16Δ in the esodeviation group and 56Δ ± 5Δ in the exodeviation group. The final postoperative mean deviation was 6Δ ± 7Δ in the esodeviation group and 6Δ ± 8Δ in the exodeviation group. There were 7 patients (87.5%) with final deviation of ≤10Δ in the exodeviaton group and 4 (80%) in the esodeviation group.

CONCLUSIONS: Adjunctive usage of BTA with conventional surgery appears to enhance surgical outcomes by increasing the amount of expected correction. The combined use of BTA with monocular recession-resection rectus muscle surgery may be a good alternative in the treatment of large-angle sensory strabismus with the advantage of less risk of potential complications compared to supramaximal surgery or surgery in the "good" eye.

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