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목적 : To investigate the long-term clinical course of intermittent exotropia after surgical treatment to determine whether and when postoperative exo-drift stabilize, and the post-surgery follow-up duration required in cases of intermittent exotropia.
방법 : We reviewed retrospectively the medical records of patients diagnosed with intermittent exotropia who underwent surgical treatment between January 1992 and January 2006 at Yeungnam University Hospital and performed regular follow-ups up to 7 years postoperatively. In addition, we analyzed the difference in exo-drift stabilization according to the surgical procedure. Thirty-one patients underwent lateral rectus recession and medial rectus resection (R&R) and 70 patients underwent bilateral lateral rectus recession (BLR).
결과 : The postoperative angles of deviation increased significantly throughout the initial 36 months, while no subsequent significant changes were observed up to 84 months. When found that >50% of the exo-drift observed over the 7 years occurred during the first postoperative year. In addition, a correlation was found between the angles of deviation at 1 and 7 years postoperatively (Pearson’s correlation coefficient r=0.517, p<0.001). BLR displayed no significant exo-drift after 36 months’ follow-up, whereas for R&R this was present from 18 months.
결론 : The minimum postoperative follow-up required after surgical treatment to ensure a good and stable result is 36 months. In particular, careful follow-up is necessary during the first postoperative year to detect rapid exo-drift. Patients who underwent BLR require a longer follow-up than those who underwent R&R to ensure good long-term surgical results
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