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  • Title: [Comparative study on diagnostic significance of urethral sphincter versus external anal sphincter electromyography in patients with multiple system atrophy].
    Author: Qiu F, Liu JG, Li LP, Song DD, Yao W, Qi XK.
    Journal: Zhonghua Yi Xue Za Zhi; 2013 Jul 02; 93(25):1958-61. PubMed ID: 24169243.
    Abstract:
    OBJECTIVE: To evaluate the diagnostic value of external anal sphincter electromyography (EAS-EMG) versus urethral sphincter electromyography (US-EMG) in patients with multiple system atrophy (MSA). METHODS: A total of 27 MSA patients were examined with EAS and US-EMG as treatment group while 28 non-MSA subjects as control group. Spontaneous activities during relaxation, mean duration & amplitude of motor unit potential (MUP), percentage of polyphasic and variations during strong contraction were recorded and analyzed statistically. RESULTS: There was significant difference in light contraction between MSA and non-MSA cases on both EAS-EMG and US-EMG (EAS-EMG, P < 0.001; US-EMG, P = 0.002) . Meanwhile, strong contraction and percentage of polyphasic showed significant differences between MSA and non-MSA cases on EAS-EMG only (strong contraction, P = 0.016; percentage of polyphasic, P = 0.004) . EAS-EMG showed more significant changes in neurogenic injury than US-EMG. CONCLUSIONS: US-EMG and EAS-EMG are valuable for the diagnosis of MSA. The differences of multiple parameters of EAS-EMG were more significant than those of US-EMG for MSA cases. US-EMG may serve as a supplement of EAS-EMG in case of restriction.
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