Strabismus Surgery in Myasthenia Gravis.

Chun, Boyoung; Kim, Seung Hyun

doi:2009.50.12.1902

J Korean Ophthalmol Soc > Volume 50(12); 2009 > Article

Case Report

Journal of the Korean Ophthalmological Society 2009;50(12):1902-1908.
DOI: https://doi.org/10.3341/jkos.2009.50.12.1902 Published online December 15, 2009.

Strabismus Surgery in Myasthenia Gravis.

Boyoung Chun, Seung Hyun Kim

Department of Ophthalmology, Korea University College of Medicine, Ansan, Korea. ansaneye@hanmail.net

중증근무력증 환자에서의 사시수술

천보영ㆍ김승현

Department of Ophthalmology, Korea University College of Medicine, Ansan, Korea

Abstract

PURPOSE
To report the results of strabismus surgery in five patients diagnosed with myasthenia gravis with strabismus. CASE SUMMARY: The authors retrospectively analyzed the effect and timing of surgery for patients who developed strabismus after being diagnosed for myasthenia gravis. Cases 1 and 2 were female myasthenia gravis patients, eight and 45 years of age, who underwent surgery after symptoms developed for correction of exotropia at 33 months and ten years after diagnosis, respectively. Case 3 was a 33-year-old male hyperthyroidism patient who had an exotropia operation six years after his strabismus diagnosis. Cases 4 and 5 were a 22-year-old female and a 50-year-old male patient, who underwent surgery for correction of left hypotropia at 14 months and ten months after diagnosis, respectively. Eventually, a total of three cases of horizontal deviation and two cases of vertical deviation had successful outcomes resulting within ten prism diopters. The patients in cases 4 and 5, both of whom had vertical deviations, experienced a short wait time from the date of symptom presentation until they were able to receive surgery. In particular, case 5 developed left hypertropia two months prior to surgery and the strabismus angle increased until six months prior to surgery. However, the hypertropia stabilized afterwards and the patient finally obtained orthophoria after a left inferior rectus advancement operation. CONCLUSIONS: In patients diagnosed with myasthenia gravis and a large angle strabismus, a longer follow-up period from diagnosis to operation is necessary for a successful postoperative outcome and stable strabismus angle.

Key Words: Myasthenia gravis;Strabismus surgery