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@#: ObjectiveTo compare the clinical significance of motor unit number estimates (MUNE) and conventional electromyogram (EMG) in the evaluation of neuromuscular disorders. MethodsUnder the model of MUNE or quantity of motor unit potential (QMUP), 53 patients with various neurogenic disorders were tested with EMG at extensor digitorum brevis, thenar, or hypothenar eminence. ResultsFor 8 patients with amyotrophic lateralizing sclerosis, large and long-duration polyphasic potentials were detected in needle electrode EMG tests, and the motor unit numbers reduced. For 45 patients with peripheral neuropathies, few distinctive features could not be detected by needle electrode EMG, but motor unit numbers reduced in 2 patients; spontaneous activities were the only abnormality in the other 2 patients, and there were no obviously abnormal changes in the configuration and size of motor unit potentials and in motor unit numbers; EMG tests revealed neurogenic features and motor unit numbers significantly reduced in the remaining 41 patients. ConclusionConventional EMG and MUNE can work for the diagnosis of neuromuscular disorders, and do better in combination.
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Objective To study the value of discriminant analysis of motor unit potential(MUP) multi-parameters in differentiation of various sorts of MUP. MethodsFrom the biceps brachii, tibialis anterior and vastus medialis muscles,the duration, amplitude, area and the ratio of area to amplitude of the MUPs were obtained by use of the spike-wave triggered average technique in 10 patients with myopathic disease, 13 patients with neurogenic disease and 22 healthy adults. The data were subject to analysis of variance and discriminant analysis. ResultsThe differences among the three groups with regard to all the parameters of the MUPs recorded from all the three muscles were statistically significant ( P
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Objective:To investigate varied electromyographic types in the patients with hemimasticatory spasm(HMS).Methods:Surface electromyography was recorded to study electromyographic features of 16 cases with HMS.Results:Spasm was found in mandibular rest position in 2 cases and in tooth contact position in 14 cases.During the involuntary spasm of the 14 cases, motor unit potential could be classified into three types:continuous(8 cases), rhythmic(3 cases) and irregular(3 cases).Conclusion:The electromyographic feature of hemimasticatory spasm is characterized by continuous motor unit potential discharge. The spasm is mostly triggered by tooth contact.
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Thenar motor unit number estimation(MUNE) was performed in 49 normal subjects without known neuromuscular diseases using statistical method. The purposes of this study were to compare MUNE parameters between the dominant and non-dominant hands and to evaluate the changes according to age. Reproducibility was assessed in 20 subjects also. The results showed that thenar motor units number, maximum negative peak compound muscle action potential (CMAP) area and mean area of single motor unit potentials(SMUP) were not different between dominant and non-dominant sides, but maximum negative peak CMAP amplitude was larger in dominant than non-dominant side. With aging, the motor unit number, maximum negative peak CMAP amplitude and area decreased and the mean area of single motor unit potentials increased. There was a high reproducibility between the test and the retest values for motor unit number, maximum negative peak CMAP amplitude and area as well as mean area of single motor unit potentials. The statistical estimate of the motor unit number is a reliable method and easily available in clinical settings. The results of this study are expected to be used as a baseline data for the future.
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Potenciales de Acción , Envejecimiento , Mano , Músculos , Enfermedades NeuromuscularesRESUMEN
Two patients of a family, suffenng from frequent periodic paralysis, were evaluated. Their family history reveals seven affected members in three generations, with autosomal dominance pattern. Their earliest symptoms were noticed between 10-13 years of age. The serum potassium level fell during the attack. EMG demonstrated progresslve reduction in numer of motor units and drop off in the response of muscle fibers to stimuli. These findings were consistent with familial hypokalemic periodic paralysis. The clinical features, electron microscoscopic findings, and pathogenesis were also described.