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目的:采用定量和定性相结合的肌电图方法对肌张力障碍(dystonia)病人进行测定,观察肌电活动情况,评价肌电图在捡出异常肌肉中的价值。方法:观察肌张力障碍患者48例,正常健康人群12例分别在静息时、小收缩时和大收缩时的肌电活动。结果:肌张力障碍患者在静息时有不规则的群化电位出现,或活动后运动单位持续存在,是肌肉痉挛的特异性改变;大收缩时募集相不完全其转折数明显降低。结论:所有肌电图的表现提示上运动神经元-脊髓、脑干或大脑皮层的异常放电,对病人进行肌电图检查有助于提高受损肌肉的检出率。
OBJECTIVE: To determine the value of myoelectrical activity (EMG) in the detection of dystonia by quantitative and qualitative EMG method and to evaluate the value of EMG in detecting abnormal muscle. Methods: Forty-eight patients with dystonia and 12 healthy subjects were observed for myoelectrical activity at rest, during small systole and during major systole. Results: In dystonia patients, there are irregular grouping potentials at rest or the persistence of motor units after exercise, which is the specific change of muscle spasm. When the large contraction is incomplete, the number of turning points is obviously decreased. CONCLUSIONS: All EMG findings suggest abnormal discharges of upper motor neurons - the spinal cord, brainstem or cortex, and electromyography examination of patients may improve the detection rate of damaged muscles.