J Korean Ophthalmol Soc.
1991 Jan;32(1):89-95.
Clinical Evaluation of Myasthenia Gravis Using Electromyography
- Affiliations
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- 1Department of Ophthalmology, Catholic Medical College, Seoul, Korea.
Abstract
- A clinical study was performed on 27 patients with myasthenia gravis diagnosed at the Department of Ophthalmology, St. Mary's Hospital, Catholic University Medical College from January 1986 to December 1989, including electromyography, chest CT scan and thyroid function test. The results were as follow: 1. The patients were classified as group I;14 patients(51.9%), most common, group II(A);8 patients(29.6%) and group II(B);5 patients(18.5%) based on the modified Osserman's classification. 2. Ocular symptoms were ptosis in 25 patients(92.6%), diplopia in 10 patients(34. 4%), limitation of ocular movement in 4 patients(14.8%). Systemic symptoms were dysphagia and weakness of extremeties in 6 patients(22.2%) and general weakness in 5 patients(18. 5%). 3. In EMG study, among the 27 patients, 17 patients(63%) revealed positive response. Positive rate according to clinical classification was 50%(7 of 14 patients) in group 1,62.5%(5 of 8 patients) in group II(A) and 100%(all 5 patients) in group II(B). The more severe the symptoms, the more positive were the findings. 4. The associated thymic disorders were thymoma in 4 patients(14. 8%), thymic hyperplasia in 2 patients(6.9%) and malignant thymoma in 1 patient(6.9%).
