期刊
MUSCLE & NERVE
卷 57, 期 4, 页码 683-686出版社
WILEY
DOI: 10.1002/mus.25977
关键词
CAG repeat; compound muscle action potentials; correlation; electrophysiological findings; sensory nerve action potentials; spinal and bulbar muscular atrophy
IntroductionSpinal and bulbar muscular atrophy (SBMA) is caused by the expansion of a CAG repeat in the androgen receptor gene. The relationship between the CAG repeat size and electrophysiological findings is not completely understood. MethodsWe retrospectively analyzed 62 SBMA patients to assess the correlation between their CAG repeat size and electrophysiological findings. ResultsIn multiple regression analysis including age at examination and disease duration, we identified a negative correlation between the CAG repeat size and the compound muscle action potential (CMAP) amplitude. No significant correlation was found between the CAG repeat size and sensory nerve action potential (SNAP) amplitude. DiscussionContrary to previous reports of motor- and sensory-dominant phenotypes correlating with CAG repeat sizes, the CAG repeat size was negatively correlated only with CMAP amplitude, and not with SNAP amplitude. Muscle Nerve57: 683-686, 2018
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