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《Academic Journal of Pla Postgraduate Medical School》 2005-05
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Myotonic dystrophy: Pathological and electrophysiological study on 8 patients

ZHAO Xiao-ping,PU Chuan-qiang,WU Wei-ping,CHEN Zhao-hui,LIU Jie-xiao,MAO Yan-ling,LUO Ping(Department of Neurology,PLA General Hospital,Beijing 100853,China)  
Objective:To identify the relationship between pathological features and electrophysiological changes in patients with myotonic dystrophy(DM).Methods:Eight subjects diagnosed as myotonic dystrophy in PLA General Hospital were studied about their muscle pathological findings,routine electromyography(EMG) and nerve conductive velocity(NCV) changes retrospectively.Results:Classical myopathic changes of DM were found in these muscle biopsies.With ATPase staining,there was no consistent abnormality of fiber type distribution,with 4 specimen having type I predominance and 4 having type II predominance.EMG was abnormal in all patients showed potentials of myotonia and myogenic damage.Compared with the cases with type II predominance,the rates of insert spontaneous potentials extension,the degree of motor unit potentials(MUP) duration shortening,and the percentage of polyphasic potentials were higher in the cases with type I predominance(83.3% vs 16.7%: χ~(2)=14.9610,P= 0.000,Fisher's exact=0.000;36.8% vs 19.3%: t=2.7253,P=0.0102;and 24.4% vs 11.0%: t=3.1901,(P=0.0030).)Conclusion:In patients with DM the severity of the myoelectrophysiological changes were related to the pathological features,especially to the predominant fibre type.
【Key Words】: myotonic disorder electrophysiology pathology
【CateGory Index】: R746.2
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1 Yang Yiner Ma Chuhong Qian Yongdong Dai Yan(P.E.College of Zhejiang Normal University,Zhejiang Jinhua 321004);The Analysis Of Power Spectrum Of The Climber Athletes' Wrist Flexor And Extensor Muscle Of Upper Limb With Different Muscle Power Training[J];Journal of Anhui Sports Science;2006-06
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