Factors Affecting the Surgical Outcome of Primary Exotropia in Children.

Objective: The objective of current study to evaluate the outcome results of the surgical correction and as well as the effects of some factors on the outcome and surgical response of primary exotropia. Study Design: Retrospective Clinical Study. Place and Duration of Study: Hamad Medical Corporation –Tertiary Hospital in Qatar, study done over six months. Methods: Medical records of patients who underwent surgical correction of primary exotropia procedures between the years 2008 and 2013 were retrospectively reviewed. Patients less than 15 years of age were included in the study and the following data were collected: onset age of squint, age at surgery, type of exotropia, visual acuity, presence of amblyopia, anisometropia, refractive error (spherical equivalent), preoperative deviation, AV pattern, stereopsis, type of surgery and analysis using descriptive statistics, unpaired t- and chi-square statistical tests. Results: Of 74 patients we studied, 30 Male (40.5%), 44 Female (59.5%), 46 patients (62.2%) had successful surgical outcome, and 28 patients (37.8%) had unsuccessful outcome (all under correction). The response to surgery correlated mainly to with the preoperative angle. A higher response resulted from larger preoperative deviation and it this was better with lateral plus medial rectus muscle recessions than with bilateral lateral rectus recession. Conclusions: Preoperative deviation was the most important factor in determining better response to surgical correction of primary exotropia, and accurate measurement of the angle of deviation can improve the outcome and response to surgery.

Surgical Outcomes of Large-Angle Exotropia

PURPOSE: To examine the surgical results of large-angle exodeviations over 30 prism diopters (PD) and correlation factors influencing surgical outcomes. METHODS: The authors retrospectively examined 63 patients with an exodeviation greater than 30 PD. All patients were examined for at least six months after the operation. Near and far deviation angles, age at operation, operation method, and alignment at postoperative one week, one month, three months and six months were analyzed as factors influencing the surgical outcome. RESULTS: The preoperative deviation was 35 to 40 PD (38.1%) in most cases. Forty-five patients underwent bilateral lateral rectus recession, 16 patients underwent unilateral medial rectus resection and lateral rectus recession, and two patients underwent surgery on three different muscles. Success was defined as sustained alignment from esotropia 10 PD to exotropia 10 PD. The success rate was 79.4% at the first week, 77.8% at one month, 73.0% at three months, and 68.3% at six months postoperatively. In particular, the success rate was significantly lower at six months postoperatively in the group with exotropia greater than 45 PD (36.4%). The patients with esotropia on the first postoperative week showed a significantly high success rate (86.6%); however, neither the age at operation nor the operation method affected the surgical results. CONCLUSIONS: Large-angle exodeviations can be successfully approached with a single operation, with a success rate of 68.3% at six months postoperatively. Esotropia of less than 10 PD at the first postoperative week shows the most ideal surgical results. For patients having exodeviations greater than 45 PD, the success rate will decrease over time. Therefore, surgeons should carefully plan for large-angle exodeviation surgery.

Effect of Both Lateral Rectus Resection for Residual Esotropia

PURPOSE: To investigate the surgical outcome of both lateral rectus resection in the treatment of residual esotropia with previous both medial rectus recession METHODS: The medical record of 30 patients who had underwent both lateral rectus resection from 1996 to 2001 for residual esotropia occurred after bilateral medial rectus recession and who had followed up for more than one year, were analysed retrospectively. Successful outcome was defined as esotropia 0.05), but it was not significant statistically. Postoperative angle of deviation in group II was increased from 8.1+/-4.6PD at postoperative 1 day to 13.8+/-7.9PD at postoperative 1 year (p<0.001). CONCLUSIONS: Both lateral rectus resection is an effective method in the treatment of residual esotropia less than 40 PD.