Clinical Focus ›› 2022, Vol. 37 ›› Issue (6): 490-496.doi: 10.3969/j.issn.1004-583X.2022.06.002

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Meta analysis on diagnostic value of external anal sphincter electromyography in multiple system atrophy and Parkinson's disease

Sun Yanan1, Hao Yifeng2, Li Xiaohong1()   

  1. 1. Department of Neurology, Dalian Municipal Friendship Hospital, Dalian 116001, China
    2. Shenzhen Longgang District Shang Shantang Clinic, Shenzhen 518116,China
  • Received:2021-05-02 Online:2022-06-20 Published:2022-08-05
  • Contact: Li Xiaohong E-mail:xhlihh@126.com

Abstract:

Objective To evaluate the diagnostic value of external anal sphincter electromyography (EAS-EMG) in multiple system atrophy (MSA) and Parkinson’s disease (PD). Methods Computer retrieval was applied for PubMed, Web of science, Cochrane library,Embase,CBM disc,CNKI,Wanfang Data, and relevant studies on EAS-EMG in MSA and PD with the retrieval duration extending from the library setup to January 1st,2021 were selected. The literature were screened out based on the inclusion and exclusion criteria by two independent researchers. Quality of studies was assessed according to the Newcastle-Ottawa Scale(NOS). The detection on the data merger and publication bias was performed with Software Revman5.3. Results A total of 14 studies were included, including 2 cohort studies and 12 case-control studies. The NOS scores of all studies were ≥6 points. Meta analysis results showed the duration of mean motor unit potential (MUP) in MSA group was significantly longer than that in PD group (MD=2.70, 95%CI=2.07-3.34); average MUP amplitude in the MSA group was higher than that in the PD group (MD=43.21, 95%CI=-7.36-93.78); the percentage of polyphase wave in the MSA group was significantly higher than that in the PD group (MD=13.34, 95%CI=6.22-20.46); the time limit of MUP >10 ms% in the MSA group was significantly higher than that in the PD group (MD=18.88, 95%CI=4.89-32.87); and the percentage of satellite potential in the MSA group was significantly higher than that in the PD group (MD=8.36, 95%CI=3.85-12.86). The Study was found to have a slight publication bias. Conclusion EAS-EMG delivers important reference value in the differential diagnosis of MSA and PD. The duration of mean MUP, percent of multiphase wavE, MUP duration >10 ms% and satellite potential % in EAS-EMG delivers high diagnostic value, while MUP amplitude exhibits less diagnostic value. EAS-EMG may be of greater value in the differential diagnosis on MSA and early PD, and further studies are required.

Key words: external anal sphincter electromyography, multiple system atrophy, Parkinson’s disease, Meta analysis

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