Prognostic Factors Predicting the Surgical Outcomes of Bilateral Lateral Rectus Recession for Patients with Concomitant Exotropia in Chiang Mai University Hospital
Supaporn Trakanwitthayarak MD*, Prapatsorn Patikulsila MD*
Affiliation : * Department of Ophthalmology, Faculty of Medicine, Chiang Mai University Hospital, Chiang Mai, Thailand
Objective : To determine the preoperative variables affecting early and late favorable outcomes of bilateral lateral rectus
recession surgery for concomitant exotropia.
Material and Method: A retrospective study of 65 patients with concomitant exotropia (constant and intermittent) who had
bilateral lateral rectus recession was conducted. The follow-up period was more than 1 year in all patients. Preoperative
parameters were obtained and evaluated using univariate analysis.
Results : Sixty-five patients with concomitant exotropia who underwent bilateral lateral rectus recession were included.
In the early and late postoperative outcome, 78% and 82% of the patients were in the success group, respectively.
Meanwhile, 22% and 18% were in the failure group, respectively. There was no association between postoperative outcome
and preoperative variables i.e. age at onset (p = 0.841, 0.591), age at surgery (p = 0.564, 0.634), interval between onset
and surgery (p = 0.506, 0.753), preoperative deviation (p = 0.278, 0.211), refractive error (p = 0.217, 0.136), anisometropia
(p = 0.946, 0.946), phase of exotropia (p = 0.741, 0.013), A-V pattern (p = 1.000, 1.000), stereopsis (p = 0.841, 0.268) and
amblyopia (p = 0.569, 0.567).
Conclusion : Preoperative variables could not be used to predict the early and late postoperative outcome.
Keywords : Exotropia, Bilateral lateral rectus recession, Preoperative factor
