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Journal of the Korean Academy of Rehabilitation Medicine 1978;2(2):5.
Electrodiagnostic Study of a Dermatomyositis Patient with Carpal Tunnel Syndrome
Jin Ho Kim, M.D.
Dept. of Rehabilitation Medicine, Seoul National University Hospital
Carpal Tunnel Syndrome을 동반한 피부근염환자의 근전도소견
서울대학병원 재활의학과

Carpal tunnel syndrome is frequently accompanied or preceded by certain lesion such as trigger finger or thumb, diabetes mellitus, rheumatoid arthritis, periarthritis-shoulder, etc. It is rather rare and of some interest to observe CTS with dermatomyositis. Recently such a case was seen at SNUH and reported hereby. The electrodiagnostic finding was characteristic of dermatomyositis (or polymyositis) and concomittant CTS:

1. Myopathic pattern, throughout--i.e., short duration motor unit action potential, short duration polyphasic potential, etc.

2. Abundant abnormal spontaneous activity--Fibrillation potentials, positive sharp waves, high frequency bizzare discharge, insertional activity, more marked in proximal group of muscles.

3. Prolonged latency of motor and absent sensory nerve action potential of Rt. median nerve.

4. Normal nerve conduction velocity.

Key Words: Dermatomyositis, Carpal tunnel syndrome, Electrodiagnosis, Nerve conduction study


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