Diagnostic significance of urethral sphincter electromyography and external anal sphincter electromyography in patients with multiple system atrophy

VernacularTitle:多系统萎缩患者的尿道括约肌和肛门括约肌肌电图对比分析
Author: Feng QIU ; Xiaokun QI ; Liping LI ; Jianguo LIU ; Wei YAO
Publication Type:Journal Article
Keywords: Multiple system atrophy; Urethra; Ara] canal; Electromyography
From: Chinese Journal of Neurology 2012;45(3):188-191
CountryChina
Language:Chinese
Abstract: Objective To assess the significance of urethral sphincter electromyography (US-EMG) and external anal sphincter electromyography (EAS-EMG) for the diagnosis of multiple system atrophy (MSA).Methods US-EMG and EAS-EMG were performed in 9 patients who were diagnosed as MSA.Duration,motor unit action potentials amplitude,polyphasicity,as well as recruited pattern and amplitude during powerful contraction were recorded and analyzed.Results Among 9 patients who were diagnosed as MSA,7 cases showed neural injury by both US-EMG and EAS-EMG.There was significant difference of electromyographic findings between US-EMG group and EAS-EMG group (average volatility (μV):1063.44 ±499.92 vs 634.89 ±265.07; polyphasic wave:0(0,20％ ) vs 57％ (28％,63％ ) ; t =2.567,P=0.033;t =2.833,P=0.012).Conclusions Although US-EMG may be difficult to perform,US-EMG may have the same specificity as EAS-EMG for the diagnosis of MSA,especially for the diagnosis of MSA patients only with urination disorders,who are involved in Onuf neclear according to some of the abnormal indexes.