Electromyographic pattern in Duchenne and Becker muscular dystrophy. Part II. Electromyographic pattern in Becker muscular dystrophy in comparison with Duchenne muscular dystrophy.

Background: The aim of this study was to compare the electromyographic pattern in Becker muscular dystrophy (BMD) with that found in Duchenne muscular dystrophy (DMD).

Material And Method: Fourteen men with BMD and 51 boys with DMD were investigated. Proximal muscles were examined: m.

Electromyographic pattern in Duchenne and Becker muscular dystrophy. Part I: Electromyographic pattern in subsequent stages of muscle lesion in Duchenne muscular dystrophy.

Background: The study was aimed to evaluate the EMG pattern in myopathy, in the muscles with early, slight abnormalities and in the muscles severely affected, and to analyze the sequence of abnormalities appearing with the progress of the impairment.

Material And Method: Fifty one boys with Duchenne muscular dystrophy were studied. Ninety nine proximal muscles (biceps brachii and rectus femoris) were examined.

MuSK-positive myasthenia gravis is rare in the Polish population.

Background And Purpose: MuSK-positive myasthenia gravis (MG) is diagnosed in 0-48% of cases with generalized seronegative MG in different populations. The presence of anti-MuSK antibodies generally relates to a severe course and lack of response to thymectomy. We analyzed for the first time the serology and clinical characteristics of MuSK-positive MG in the Polish population.