摘要目的 比较多系统萎缩(MSA)患者尿道括约肌肌电图(US-EMG)和肛门括约肌肌电图(EAS-EMG)变化特征.方法 对拟诊的9例MSA患者行US-EMG和EAS-EMG测定.分别测定运动单位的平均时限、平均波幅、轻收缩波幅、多相波以及大力收缩募集电位共5组数据,并统计分析组间差异.结果 9例MSA患者US-EMG与EAS-EMG两种检查方法均证实7例患者肌电图结果呈神经源性损伤,两种检查结果中平均波幅[( 1063.44±499.92) μV与(634.89±265.07) μV]、多相波[中位数(四分位数间距),分别为0(0,20％)与57％ (28％,63％)]差异有统计学意义(t=2.567,P=0.033；t =2.833,P=0.012).结论 US-EMG和EAS-EMG在MSA诊断中均具有较特异的诊断价值,虽然US-EMG检查实施有一定技巧性和难度,但其轻收缩波幅等指标的异常对于仅有排尿障碍而无便秘的MSA可能具有更为显著的诊断价值.

abstractsObjective 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.