Surgical outcome of exotropic Duane syndrome.

Purpose: To evaluate the surgical outcome of exotropic Duane syndrome and the factors that can influence the outcome.Methods: A retrospective study was performed on patients who had surgery for exotropic Duane syndrome with a minimum follow-up of 3 months. The ocular motility, the angles of deviation, the presence of abnormal head turn or overshoots, the surgical procedures performed, and their outcome were analyzed.Results: Sixty-seven patients were identified (mean age, 11.3 years). In unilateral cases with exotropia <25 PD (n = 28), ipsilateral lateral rectus (LR) recession was performed in all cases, and orthophoria was achieved in 25 patients (89.3%). In unilateral cases with angle ≥25 PD, ipsilateral LR recession was performed in 13 patients, bilateral symmetrical LR recession in eight patients, and unilateral LR recession and medial rectus (MR) resection in seven patients. Sequential contralateral LR recession for undercorrection was performed in seven patients. The success rate was highest in those who had unilateral LR recession and MR resection (66.7%). An increase in face turn occurred in 6 of 15 patients (40%) who had a simultaneous or sequential bilateral LR recession. In bilateral Duane syndrome, bilateral LR recession was performed in 10 patients, and was combined with ipsilateral MR resection in two patients with a success rate of 75%. Higher success rate was associated with young age at surgery (P = .03) and smaller angle of deviation (p = .04). The mean follow-up was 6.3 months.Conclusions: Surgical results in exotropic Duane syndrome are better in small angles of deviation and in younger age groups.